Main sections
SAVEBMP
SAVEBMP bmp$
Saves the image on the current back buffer to the file bmp$. This command is useful for screenshots.
The image will be saved as a 24-bit color image on all platforms.
Files can be saved in either bmp or png format. The file format is determined by the filename.
Sample:
 
PRINT "Hello World", 100, 100
SAVEBMP "Test.bmp"    // Save in bmp format
SAVEBMP "Test.png"  // Save in png format

