v1.c - new arborescence

finished making all assets and 7 out of 8 cmpr algorithms
the assets are organized in such a way that it's easier to access the most important ones first.
you can choose to customize the startup of gui through config.txt, and replace background.png (I plan to add a script to darken background)

to do (for future versions):
-develop "range fit" cmpr algorithm and/or "cluster fit"
-the mipmap function of paint layout
-fix decode rgb5a3 images
-fix decode images with palettes