Add methods for obtaining a timezone

Similar issues:

~~XPJODA-10~~ Easy access to the UTC and server timezones
~~XPJODA-7~~ Move methods from the API to the internal plugin
~~XPJODA-9~~ Regression: all functionality requires programming rights

In order to be able to use local times and transform times into a user's timezone.

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Field	Original Value	New Value
Assignee	Marius Dumitru Florea [ mflorea ]	Sergiu Dumitriu [ sdumitriu ]
Status	Open [ 1 ]	Closed [ 6 ]
Fix Version/s		1.1 [ 10429 ]
Resolution		Fixed [ 1 ]

Fix Version/s		1.2 [ 10942 ]
Fix Version/s	1.1 [ 10429 ]

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~~XPJODA-10~~	Easy access to the UTC and server timezones
~~XPJODA-7~~	Move methods from the API to the internal plugin
~~XPJODA-9~~	Regression: all functionality requires programming rights