Added player API to ents library.

[daranable]

I was unable to have the player API be in a seperate file due to the weird mixing of wrap functions required.

[ColonelThirtyTwo]

Causes infinite loops when trying to get an entity from a wirelink, probably in other places as well.

Stack traceback taken from ops counter:

stack traceback:
    addons\starfall\lua\starfall\libs_sh\ents.lua:37: in function <addons\starfall\lua\starfall\libs_sh\ents.lua:33>
    (tail call): ?
    (tail call): ?
    (tail call): ?
    (tail call): ?
    (tail call): ?
    (tail call): ?
    (tail call): ?
    (tail call): ?
    (tail call): ?
    ...
    addons\starfall\lua\starfall\instance.lua:56: in function 'runWithOps'
    addons\starfall\lua\starfall\instance.lua:187: in function '(for generator)'
    addons\starfall\lua\starfall\instance.lua:116: in function 'runScriptHook'
    addons\starfall\lua\entities\gmod_wire_starfall_processor\init.lua:116: in function 'RunScriptHook'
    addons\starfall\lua\entities\gmod_wire_starfall_processor\init.lua:103: in function <addons\starfall\lua\entities\gmod_wire_starfall_processor\init.lua:102>
    [C]: in function 'pcall'
    addons\wire\lua\wire\server\wirelib.lua:66: in function 'TriggerInput'
    addons\wire\lua\wire\server\wirelib.lua:530: in function 'Wire_TriggerOutput'
    addons\wire\lua\entities\gmod_wire_button\init.lua:131: in function 'Switch'
    addons\wire\lua\entities\gmod_wire_button\init.lua:57: in function <addons\wire\lua\entities\gmod_wire_button\init.lua:45>```