[HL2DM] Cleaner chat (Game spam blocker)

[Alienmario]

This plugin cleans up your server chat from additional or spammy messages by the game. All the blocks are optional.
The base idea comes from Tidy chat (https://forums.alliedmods.net/showthread.php?p=909778).

Cvars:
game_spam_block_teamchange 0/1 [default=1] Blocks team change messages
game_spam_block_namechange 0/1 [default=1] Block name change messages
game_spam_block_switch 0/1 [default=1] Block 'more seconds before trying to switch' messages
game_spam_block_model 0/1 [default=1] Block 'Your player model is' messages
game_spam_block_joined 0/1 [default=1] Block 'joined the game' messages
game_spam_block_svtags 0/1 [default=1] Block 'sv_tags changed' messages
game_spam_block_pausable 0/1 [default=1] Block 'sv_pausable changed' messages