fixed linking on Windows.
cosmetics.
Fixed info label padding on osx
Tweaked info colours to be more readable and less intrusive.
Tweaked separator background colour to be the same as the default border color
Merge pull request #409 from jonathantopf/styling_tweaks

More styling tweaks
cosmetics.
fixed incorrect evaluation of the Oren-Nayar BRDF.
fixed formatting and eliminated dangerous construct.
fixed RGBA readout when render widget is zoomed in and cleaned up code.
removed tabs from project explorer.
added project file watcher toggle button
Merge pull request #412 from garvitverma/public

added project file watcher toggle button