Look into handling render texture and object setup without asset and prefab

[RyanNielson]

• Automatically generate a render texture when component is added to a camera, or the settings are changed.
• Handle re-creation of render texture if it is corrupted or unallocated by Unity. Perhaps there's some useful information in here: #2
• All the user should need to do is add the component, and it handles the creation of the camera and quad if they don't exist.