Pixilang 1.5

PixiLang gets updated to version 1.5 as follows:

• added support of the SDL library on Linux;
  
• added support of fullscreen direct draw access on PalmOS;
  
• optimized code for direct drawing (SDL, DirectX, OpenGL, GAPI...);
  
• fixed bugs with bitmap drawing on Windows Mobile;
  
• fixed bug with pixi-loading after file_dialog();
  
• speed optimization;
  
• many bugs fixed.