Changed to use stored ConVar

No need to retrieve a ConVar which was stored in a variable
Fixes SF.Entities.Wrap erroring in holograms lib.

Fixes #11
Merge pull request #15 from awilliamson/develop

Fixes SF.Entities.Wrap erroring in holograms lib.
Render lib now accepts Color Type instead of RGBA.

Fixes #13
Fixed type error with render lib clear function.
Merge pull request #16 from awilliamson/develop

Render lib now accepts Color Type instead of RGBA.
Merge pull request #4 from wraith321/hologram_convar_change

Use stored convar sf_holograms_defaultquota instead of using GetConVar each time