rsx: Texture cache fixes and improvments

gl/vk/rsx: Refactoring; unify texture cache code
gl: Fixups
- Removes rsx::gl::texture class and leave gl::texture intact
- Simplify texture create and upload mechanisms
- Re-enable texture uploads with the new texture cache mechanism
rsx: texture cache - check if bit region fits into dst texture before attempting to copy
gl/vk: Cleanup
- Set initial texture layout to DST_OPTIMAL since it has no data in it anyway at the start
- Move structs outside of classes to avoid clutter

rpcs3/Emu/RSX/Common/TextureUtils.h

@@ -18,6 +18,7 @@ struct rsx_subresource_layout
 * Get size to store texture in a linear fashion.
 * Storage is assumed to use a rowPitchAlignement boundary for every row of texture.
 */
+size_t get_placed_texture_storage_size(u16 width, u16 height, u32 depth, u8 format, u16 mipmap, bool cubemap, size_t row_pitch_alignement, size_t mipmap_alignment);
 size_t get_placed_texture_storage_size(const rsx::fragment_texture &texture, size_t row_pitch_alignement, size_t mipmap_alignment = 0x200);
 size_t get_placed_texture_storage_size(const rsx::vertex_texture &texture, size_t row_pitch_alignement, size_t mipmap_alignment = 0x200);