Version 1.1.9 release

• Using "Heightmap probing feed" setting in actual probe command (may fix Denvi#546)
• Using font height for text position calculation (fixing Denvi#528)
• Various Gcode parsing improvements
• Reducing objects copy (should speedup large file processing)
• Building against Qt 5.15.2 and MSVS 2019
• Removing compilation warnings