Bird's Eye View - Spectator System

Fixing issues with TTT2

1. [TTT] Fixed an issue allowing players in the post-round phase to use weaopns while spectating in certain conditions.
2. Updated permission handling.

1. Birds will no longer trigger map entities when birdseyeview_collisions is set to 0. (Applies to trigger_once and trigger_multiple brush entities)
2. Birds should no longer be hit by traces when birdseyeview_collisions is set to 0.

1. [TTT] Fixed a compatibility issue with SpecDM.

1. [TTT] Players can no longer toggle bird mode during the Round Prep phase. (Fixes some birds with guns issues)

1. Fixed a client side error when using ULib.

* Added support for SAM permissions.

1. Added server-side cvar birdseyeview_highlight (Default 1). When enabled, birds are highlighted to other birds and spectators.
2. Added server-side cvar birdseyeview_health (Default 5). Sets the starting health when birds spawn.
3. Player's health is now updated to match bird's health. This should fix some UI weirdness in DarkRP.

1. xAdmin permission support.

1. Birds that die in a fire will no longer result in fiery ghost spectators.
2. Possible fix for addons using traces hitting birds when they shouldn't. Birds will still be affected by traces if collisions are enabled (birdseyeview_collisions greater than 0).

1. Added server-side cvar birdseyeview_collisions (Default 0). Set to 1 to collide with entities and props. Set to 2 to also collide with players.
2. Added server-side cvar birdseyeview_allow_drive (Default 0), allows birds to enter vehicles.
3. Birds are no longer able to use objects.
4. Birds can no longer spawn items from the spawnmenu.
5. [DarkRP] Blocked most purchases while in bird mode (F4 menu, doors, vehicles).

1. Significantly improved clientside performance of bird's light.