release-0.5.6.3: Release 0.5.6.3

Release 0.5.6.3

Extended the Asset Loader to convert sprite sheets wider than 32 pixels. The sprites will be de-interlaced.
Added the "big tile" images in the Tile Editor.
Now, users can pick two tiles, associated with the left and righ button, to make drawing a little bit easier.
When resetting the CPU (from the Main window or the CPU window), if the SD card is loaded, reload the contents.