Clean up project settings.

- Create single platform config named x86 and have all projects target x86.
- Remove Release config (broken anyway).
- For the Debug config, ensure TRACE and DEBUG constants are set and unsafe code is allowed for all projects (same as the makefile).
- Warn level 4 and optimizations off were removed from the config automatically by VS (it assumes these values by default, and these match the makefile).
- The CrashDialog project can reuse the icon from the Game project as long as the path is set correctly.
- Fix TS project so it builds (I know it's going but its annoying that the project must be unloaded).
Merge pull request #5673 from RoosterDragon/solution-config

Clean up project settings
Changed HardwarePalette.ApplyModifiers to be more efficient.

- Add separate ImmutablePalette and MutablePalette classes since the distinction is extremely important to HardwarePalette.
- Keep a cache of palettes in HardwarePalette to avoid reallocation them every time ApplyModifiers is called.
- Palettes that are not allowed to be modified are copied to the buffer once when added, rather than every time ApplyModifiers is called.
- The AdjustPalette method now takes a read-only dictionary to prevent the dictionary being messed with.
- Added a constant for the palette size to remove its usage as a magic number in several areas.
- The ColorPreviewManagerWidget is annoying in that it needs to actually permanently update a palette after it has been added. To allow this, HardwarePalette now allows a palette to be replaced after initialization. The WorldRenderer therefore now also updates the PaletteReference it created earlier with the new palette to prevent stale data being used elsewhere.