Disable dark mode in macOS

Until there is a correct implementation for dark mode colors, dark mode
is disabled. To this end a Info.plist template was placed under
Building/MacOS, containing the required setting.

Building/MacOS/Info.plist.in

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleExecutable</key>
+	<string>OSCAR</string>
+	<key>CFBundleGetInfoString</key>
+	<string>Created by Qt/QMake</string>
+	<key>CFBundleIconFile</key>
+  <string>${ASSETCATALOG_COMPILER_APPICON_NAME}</string>
+	<key>CFBundleIdentifier</key>
+  <string>${PRODUCT_BUNDLE_IDENTIFIER}</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>LSMinimumSystemVersion</key>
+  <string>${MACOSX_DEPLOYMENT_TARGET}</string>
+	<key>NSPrincipalClass</key>
+	<string>NSApplication</string>
+	<key>NSSupportsAutomaticGraphicsSwitching</key>
+	<true/>
+	<key>NSRequiresAquaSystemAppearance</key>
+	<true/>
+</dict>
+</plist>

OSCAR_QT.pro

@@ -10,3 +10,7 @@ TEMPLATE = subdirs
 SUBDIRS += oscar
 
 CONFIG += ordered
+
+macx: {
+    QMAKE_INFO_PLIST = Building/MacOS/Info.plist.in
+}