QTempGaussMC: Rewrite (#373)

Changes:
 - Docs have been completely rewritten
 - mask_shimmer is now a public function
 - ruff warnings fixed
 - Settings builder has been split into a separate class
 - Processing has been split into a separate class
- Chained method calls have been replaced with a proper graph builder
using lazy processing
 - Redundant enums deprecated
 - General code refactors for correctness/readability
 - Can now pass your own motion vectors
 - thsad2 added
 - Sharpening has been reworked and is now scaled sanely
 - misc fixes

Author: emotion3459