[ModView] Fixes for OS X
Merge branch 'modview-qt' of https://github.com/xycaleth/OpenJK into modview-qt
Merge branch 'modview-qt' of https://github.com/xycaleth/OpenJK into modview-qt
[ModView] 64-bit fix for ulong type

Previously, ulong was typedef'd to unsigned long which is 64-bits on
some 64-bit systems. This commit replaces unsigned long with unsigned
int. While still not strictly correct, it was the easiest way to fix it.
[ModView] Fix non-standard function usage
[ModView] Hide treeview focus rect in OS X