Sound and Music block, Hide Weapons and Hats

[Joaquel]

These changes were originally made by foolishservers(all credits to all of them), but all the forks got affected by the DMCA.

This includes 4 new parameters that should fix #16:

• "existing_sound_block"
• "existing_music_block"
• "hide_weapon"
• "hide_hat"

Here is an example with the Hat Kid Smug Dance (i can't add these to the Repo wiki rip):

		"models/player/scout.mdl"
		{
			"model"		"models/emotes/smug/hatkid.mdl" // Model Path
			"index"		"1157"                                              // Taunt index (Kazotsky Kick)
			"existing_sound_block"		"1"                            // NEW: Blocks all taunt sounds** (not music)
			"existing_music_block"		"1"                            // NEW: Blocks the taunt music
			"hide_weapon"		"1"                                    // NEW: Hides weapons and weapons wearables (still needs fix for Contracker, Demo Shield, etc etc...)
			"hide_hat"		"1"                                           // NEW: Hides player cosmetics
			"sound"		"misc/bailes/hatkid_taunt.wav"       // Custom music sound
		}