crt-royale: Added an INTEGRATED_GRAPHICS_COMPATIBILITY_MODE option

crt-royale:
Added an INTEGRATED_GRAPHICS_COMPATIBILITY_MODE option for Intel HD 4000
(disabled by default) and new .cgp presets that enable it out of the box.  This mode
disables some high-quality settings.  Updated README.TXT accordingly.

Other changes:
Moved source files into the src directory, so users can more easily find the
user-settings.h file (etc.).

Replaced levels_underestimate setting with bloom_underestimate_levels, which should
be more clear and has a higher max value.

Also changed some Windows CRLF line endings to Unix LF endings:
I'm not sure how I ever put CRLF endings into the repository to begin with,
but this should fix that.