Image library enhancements

[a740g]

This PR add the following new features to the QB64-PE image library:

• SVG support (file and buffer)
• QOI format support (file and buffer)
• High quality pixel scaler support
  • Scalers can be used only during image loading and thus has zero performance impact when the image is in use
  • 6 supported scalers that can be used by specifying the scaler name in _LOADIMAGE's requirements$ string
    • SXBR2 - Super-xBR 2x
    • MMPX2 - MMPX Style-Preserving 2x
    • HQ2XA - High Quality Cartoon 2x
    • HQ2XB - High Quality Complex 2x
    • HQ3XA - High Quality Cartoon 3x
    • HQ3XB - High Quality Complex 3x
• Implements the _SAVEIMAGE command
  • Syntax: _SAVEIMAGE fileName$[, imageHandle&][, requirements$]
  • Can save to 6 image formats: png, qoi, bmp, tga, jpg and hdr
  • Can save text screens and surfaces as an image file

I'll start adding the license updates once all tests passes.