Update

• Remove QT4
• Fix some QT / OpenGL calls

externals/qtcolorpicker/buildlib/buildlib.pro

-TEMPLATE=lib
-CONFIG += qt dll qtcolorpicker-buildlib
-mac:CONFIG += absolute_library_soname
-win32|mac:!wince*:!win32-msvc:!macx-xcode:CONFIG += debug_and_release build_all
-include(../src/qtcolorpicker.pri)
-TARGET = $$QTCOLORPICKER_LIBNAME
-DESTDIR = $$QTCOLORPICKER_LIBDIR
-win32 {
-    DLLDESTDIR = $$[QT_INSTALL_BINS]
-    QMAKE_DISTCLEAN += $$[QT_INSTALL_BINS]\\$${QTCOLORPICKER_LIBNAME}.dll
-}
-target.path = $$DESTDIR
-INSTALLS += target