Added new import config rule: AlwaysPresentImageMaps so it will add entries for the regular map inputs on a material, even if they weren't actually found
Disabled a number of inactive popup menu items
Added Create New Module to normal add asset popup for more obvious/simplified use-flow
Adjusted the editor loading logic so it will properly display the loading splash to inform loading is happening instead of just lagging
Adjusted the assimp shape loader code so if it doesn't find a texture, and thus just sets a material value as the material color, it has a more parsable formatting
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.
