Implement remaining compression methods for bitmaps

[jmeaster30]

I have not implemented most of the compression methods the following list is a TODO list of these:

• [x] RGB
• [ ] RLE8
• [ ] RLE4
• [x] BITFIELDS
• [ ] JPEG
• [ ] PNG
• [ ] ALPHABITFIELDS
• [x] CMYK
• [ ] CMYKRLE8
• [ ] CMYKRLE4