Update to version 1.7.0, change log entries, materials.

Fixed the rcon_password variable flags: NVIDIA#176

Replaced stricmp with Q_strcasecmp to fix the Linux build.

Added change log entries for version 1.4.1.

Merge branch 'r1.4'

Renamed the reference mode to photo mode in the documentation.

Set version to 1.2.1 and added the changelog entries.

Added documentation for most of the Q2RTX console variables, commands…

… and macros.

Added more items to the changelog for 1.1.0 release.

Quake II RTX as a single commit.