Shaders: rename resources to be presentable
Shaders: add license headers to resources
Shaders: cosmetics in resources
Shaders: update installer
Shaders: update portable version packer
Shaders: massive redesign
Shaders: make use of MPC_HC_SHADER_PROFILE in .hlsl
Shaders: update changelog
Merge branch 'shaders' into private
Options Dialog: save right after pressing Apply

Fixes #2242, #2373
Merge branch 'master' into private