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.
Fixes instances where DivCeil(u32, u64) would surprisingly return u64, instead of the more natural u32.
Add an equivalent to 'Common::AlignUp(n, d) / d' and a log2 alternative.