openbor Tools

Break update to smaller functions.
Make pausemenu a separated function so movie log can ignore the input when game is paused.
Pause menu now use level's background or just blackscreen.

Optimized menu for allocating previews then caching.
Enhanced possible checks error conditions.
Cleaned up code.

Updated menu.c and screen.c due to allocscreen() now takes an additional parameter.

Nopassiveblock now can use ranges.

Code compiled and work, just commit in case...

No more stringtable, as it was useless since day to day we make changes that could or would impact it, therefore making it usesless.

Removed upper memory support from GP2X as it doesn't work.

added draw16 and spritex8p16 objects

Add some 8bit sprite/16bit screen support methods, not completed.