This formats all copyright comments according to SPDX formatting guidelines.
Additionally, this resolves the remaining GPLv2 only licensed files by relicensing them to GPLv2.0-or-later.
Update CURRENT_PROCESS_REVISION from REV9 to REVA.
Used by Nintendo Entertainment System - Nintendo Switch Online 6.0.0 and
Super Nintendo Entertainment System - Nintendo Switch Online 3.0.0.
Preliminary work for upmixing & general cleanup. Fixes basic issues in games such as Shovel Knight and slightly improves the LEGO games. Upmixing stitll needs to be implemented.
Audio levels in a few games will be fixed as we now use the downmix coefficients when possible instead of supplying our own