Added HiDPI/Retina fixes.
Added global scaling factor for fonts in order to get better control over font zooming on Windows/HiDPI.
Merge branch 'qfont' into ywm
Merge branch 'quick' into ywm
Added Qt build config files:
 - mac default config
 - mac snow leopard config
 - win default config
 - win env settings
Added .gitignore and fixed the default mac config to use relative paths.
Added documentation to the ignore list.
Merge branch 'ywm' of github.com:climov/qt5-hidpi into quick