Small improvements

[TIMONz1535]

Move docs as lua annotations comments to the code.

Add wiki samples regarding Entity.AddOutput Entity.RemoveOutput Entity.GetOutputs methods, delay and repetitions.
Add wiki samples regarding MetaTarget:IsValid.
Add wiki samples regarding remove MetaTarget outputs ent.OnOpen = nil.

Add wiki docs regarding controller:TimerSimple.
Add wiki docs regarding controller:TimerCreate.

Add docs in README regarding convars permissions. Check map_logic_override convar permissions.
Add docs in README regarding performance.
Add docs in README regarding map_logic_reload why can't it be used many times. - first tip in https://github.com/TIMONz1535/map_logic_controller/wiki#a-few-simple-rules

Check alternative output creation, add docs.

function button1:OnPressed(activator, value)
	ent:EmitSound("buttons/button24.wav")
end

Implements ents.GetMapCreatedEntity for entity list (????).