Reorg'd probe init to flow better and be more robust on load
Cleaned up various parts of the probe render manager to be more stable
Fixed issue with crash on release due to numProbe in loops being 0
Updated glsl probe array shader
Beginning of rework of editor settings
Beginning of conversion of asset import config to similar system as editor settings
This makes some tweaks to the engine to support this, specifically, it tweaks the hardcoded shaderpaths to defer to a pref variable, so none of the shader paths are hardcoded.
Also tweaks how post effects read in texture files, removing a bizzare filepath interpretation choice, where if the file path didn't start with "/" it forcefully appended the script's file path. This made it impossible to have images not in the same dir as the script file defining the post effect.
This was changed and the existing template's post effects tweaked for now to just add "./" to those few paths impacted, as well as the perf vars to support the non-hardcoded shader paths in the engine.
