[FGD] A number of entities in the FGD do not automatically make use of the `angles` property, making them unrotatable by default

[F0mx]

As title says, the following entities either use angle instead of angles, or do not default to either:

• explosive_barrel
• all four func_teleporter options
• item_radio
• light_spot
• both mystery_box variants
• all variations of perk machine
• place_model
• power_switch
• weapon_wall
• all three components of zapper