RCS Shader fixes - Githubissues

The following patches fix the current issues with the RCS shader. You don't have the current dev merged in, so I've made a diff with and without dev being merged (and conflicts resolved). The changes are:

The defaultShader and defaultColor dictionaries are keyed by the unique instance IDs of the various materials on the parts, which avoids any issues with their order getting changed.
The renderers returned by part.GetComponentsInChildren<Renderer>() are restricted to those only on the part, not on child parts (could possibly be optimised a bit more).
Only shaders that we're able to revert (i.e., those in defaultShader) are modified by the RCS snapshot process.
- This puts the onus on collecting the appropriate shaders to modify for the RCS snapshot into defaultShader instead of modifying the various shaders and then only being able to revert the ones we've stored.
- No special handling is required for missiles, bullet holes, etc., unless they want to specifically be added later.
Enable DEBUG_RADAR (Detectors) to see which materials aren't being modified for the RCS snapshot either in flight or in the RCS tool in the SPH.

Diff from PR without dev merged PR605-dev-unmerged.diff Diff from PR with dev merged/resolved PR605-dev-merged.diff

BrettRyland / BDArmory

RCS Shader fixes #605