* Make all structs readonly when applicable. It should reduce amount of needless defensive copies
* Make structs with trivial boilerplate equality code record structs
* Remove unnecessary readonly modifiers from TextureCreateInfo
* Make BitMap structs readonly too
* Add swizzle matching rules.
Improves rules which try to match incompatible formats as perfect, such as D32 float -> R32 float.
Remove Format.HasOneComponent, since this information is now available via the FormatInfo struct.
* Fix this rule.
* Update component counts for depth formats.
