Upgrade to Checkstyle 7.4

Release 7.4

New:

    Support LITERAL_SYNCHRONIZED token for NoWhitespaceAfter Rule. Author: rnveach #2803
    google_checks.xml : NO space is allowed method method name and its arguments. Author: rnveach #2809
    Support more tokens in WhitespaceAfter check. Author: MaksimP #3333
    Checker: option to allow printing exception as violation and continue execution. Author: rnveach #3611
    ImportControl: allow to load files from resources. Author: Jochen Van de Velde #3450

Bug fixes:

    NullPointerException when using NeedBraces with tokens LITERAL_CASE, LITERAL_DEFAULT. Author: liscju #3655
    CustomImportOrder should check that import groups are separated by one line only. Author: kazachka #3551
    RightCurly was misconfigured in google_checks.xml for do-while blocks. Author: Roman Ivanov #3678
    keep a map of Check name and it package in source to avoid brute force load by PackageObjectFactory from all packages. Author: Vladislav Lisetskii #3184
    Duplicated Checks in google_checks.xml config should have "id". Author: Roman Ivanov #3662
    skip unnecessary exception 'Severity not set, ignoring exception'. Author: Roman Ivanov #3657
    EmptyLineSeparator causing violation in `package-info.java`. Author: kazachka #3426
    FinalLocalVariable should not to check multi-catch variables. Author: liscju #3617
    ImportOrder: Check that import groups aren't separated internally. Author: linelect #2143

Notes:

    update documentation about getAcceptableTokens for javadoc Checks. Author: Roman Ivanov #3672
    update documentation for VariableDeclarationUsageDistance with allowedDistance = 0. Author: Roman Ivanov #3665
    Module term and usage is confusing in test area. Author: rnveach #3667
    Using the SPDX identifier for the license name. Author: Robert Reiz #3653
    XDoc: extend validation to Checker and TreeWalker. Author: rnveach #3622
    travis: use standalone shell files . Author: Roman Ivanov #3632
    CustomImportControl bad document examples that could lead to false positive on 'special group'. Author: Roman Ivanov #3590
    Add new Sevntu checks and create UT for missing checks. Author: Roman Ivanov #3628
    repo files should not have execute permissions. Author: MaksimP #3600
    use shippable CI in testing. Author: Oleg Efremenkov #3316
    100% UT coverage for ParseTreeTablePModel.java. Author: Saideep, Roman Ivanov #3606
    Set Load external DTD feature to be enabled. Author: Aurimas Liutikas #3605
    Modules and XDocs: change setter methods to recieve similar types with field type for easier xdoc validation (more 2). Author: rnveach #3575
    ImportControl: Deprecate 'url' property in favor of the 'file' property. Author: Jochen Van de Velde #3584
    Unexpected loss of coverage for PropertyCacheFile.java. Author: Roman Ivanov #3594
    Update ISSUE_TEMPLATE.md. Author: Roman Ivanov
    refactoring to ImportControlCheck . Author: kazachka #3498
    ThreadLocal usage in single threaded checkstyle. Author: Vladislav Lisetskii #2992
    Detect final methods in Enumeration for RedundantModifier. Author: rnveach #2068

Release 7.3

Breaking backward compatibility:

    Javadoc grammar: Delete child nodes in Javadoc TEXT node. Author: rnveach #3170

New:

    Update Google style coverage to state of 12 July 2016. Author: alberto.cuda #3381
    Modules and XDocs: changed setter methods to recieve similar types with field type for easier xdoc validation . Author: rnveach #3255
    CLI: Cannot override default Checker. Author: rnveach #3515
    ParameterNameCheck: new scope and excludeScope properties . Author: alberto.cuda #3473
    google_checks.xml CustomImportOrder problem. Author: Andrei Selkin #941

Bug fixes:

    GUI: Add support of DetailNode objects in CodeSelector. Author: kazachka #3432
    GUI: Inconsistency in AST structure for block-comments. Author: kazachka #3445
    Checker Cache not saving files that have suppressed violations. Author: rnveach #3488

Notes:

    ImportOrder: checkstyle_checks.xml does not have separate "java" group. Author: linelect #3577
    doc: fix broken link to file filters page. Author: Ken Geis
    use ForbidAnnotationElementValueCheck from sevntu.checkstyle. Author: rnveach #3567
    Turn on Config Cache File Locally for Developers. Author: rnveach #3487
    document isCommentNodesRequired method in xdoc. Author: Roman Ivanov #3561
    Checkstyle tests should not require internet. Author: rnveach #3536
    doc: note was placed to TranslationCheck that it has problems with Checker cache. Author: Roman Ivanov

Release 7.2

New:

    DesignForExtension: consider overridable methods and javadoc. Author: Andrei Selkin #3102
    ImportControl: allow regex in subpackage elements.. Author: Volker Boerchers #2999
    Allow WhitespaceAround for ARRAY_INIT token. Author: zenigata #3202

Bug fixes:

    Inconsistency in AST tructure for block-comments. Author: kazachka #3431
    Checker Cache invalidated falsely on load in second run due to external resources. Author: rnveach #3489
    Wrong warning from AvoidEscapedUnicodeCharacters. Author: Dzmitry Rusak #3476
    Add METHOD_REF to the list of valid tokens for OperatorCheck. Author: alberto.cuda #3472
    DetailAST should invalidate childCount cache. Author: rnveach #3486
    DetailAST should invalidate its methods cache (aka lazy-load). Author: Andrei Selkin #3466

Notes:

    Rename PkgControl to ImportControl. Author: Jochen Van de Velde #3514
    split Guard class into two. Author: Jochen Van de Velde #3497
    openjdk8/9 test code should be parseable by checkstyle . Author: Roman Ivanov #3033
    use shippable CI in testing. Author: Roman Ivanov #3316