OSX-KVM - June 2021 Batch Update

Changes:

- Upgrade to OpenCore 0.7.0

- Upgrade OVMF to ovmf_2021.05-1_all.deb

- Add installer build script for Monterey developer beta (nick)

- Sync config.plist with Nick's upstream repository

- Misc. fixes (nick and others)

scripts/monterey/Makefile

@@ -0,0 +1,19 @@
+# Builds a full installer (Monterey-full.img) for Monterey Developer Beta.
+
+# You need to opt-in to the Developer beta program first and get the Monterey installer app using System Update
+
+MONTEREY_APP=/Applications/Install\ macOS\ 12\ Beta.app
+
+all: Monterey-full.img
+
+%.img : %.dmg
+	ln $< $@ || cp $< $@
+
+Monterey-full.dmg : $(MONTEREY_APP)
+	hdiutil create -o "$@" -size 14g -layout GPTSPUD -fs HFS+J
+	hdiutil attach -noverify -mountpoint /Volumes/install_build "$@"
+	sudo "$</Contents/Resources/createinstallmedia" --volume /Volumes/install_build --nointeraction
+	hdiutil detach "/Volumes/Install macOS 12 Beta"
+
+clean :
+	rm -f Monterey-recovery.img Monterey-full.img