Added Servers White List feature
Updated README
First try to add natives

+ moved some functionality to separate functions
(MarkClientAsUnMuted|Gagged)
Fixed console immunity for blocks from web
Rewrited ExpireTimers code

Moved Close*ExpireTimer functionality to separate functions.
Rewrite UnGag|UnMute code

Moved ungag/unmute functionality to separate functions PerformUnGag,
PerformUnMute.
Added SetClientGag/Mute natives.

At this moment by using these natives you could only temporary gag/ungag
(mute/unmute) player without saving punishment to DB.
In this plugin version AUTO_UPDATE IS DISABLED. Becuase this version
isn't for public testing)
Code refactoring

A lot of code was refactored. All blocking functionality moved to
separate re-usable functions.
Removed some debug messages.
Fixed bug with unblocking by console

Fixed bug with invalid client_index/userid if Console was issuer of
command.
Fixed memory leak
Removed useless function GetClientOfUserId2
Code refactored, edited natives code.

Removed some debug information.
Fixed bug in natives

Natives was always use `session` length.
Added GetClient*Type natives
Fixed bug with expired timers
Updated README, CHANGELOG
Merge branch 'develop'
builded update-file