Add Icons, Create DMG, Codesign, Notarize

[sudara]

This PR actually does a handful of things:

• Updates to latest actions and latest GA virtual environments
• Speed up builds with ninja and clang
• Code signs VST and AU
• Adds macOS icons to the VST3/AU bundles
• Creates a notarized, customizable DMG on macOS
• Creates an InnoSetup installer which is code signed via a EV cert on Azure

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Note, I first thought we just needed to specify the icons in the Info.plist, so was adding the icns file and editing the xml.

However, icons on macOS are handled as extended attributes, thereby bypassing quarantine and codesigning checksums.

For reference (fun ruby one liner that scans for the correct xml key):

mkdir -p ${{ env.VST3_PATH }}/Contents/Resources && cp ../appdmg/pamplejuce.icns ${{ env.VST3_PATH }}/Contents/Resources/Icons.icns
cp ../appdmg/pamplejuce.icns ${{ env.AU_PATH }}/Contents/Resources/Icons.icns        
ruby -i -pe 'sub(/\<string\>/, "<string>Icons.icns") if $p=~/CFBundleIconFile/;$p=$_' ${{ env.VST3_PATH }}/Contents/Info.plist 
ruby -i -pe 'sub(/\<string\>/, "<string>Icons.icns") if $p=~/CFBundleIconFile/;$p=$_' ${{ env.AU_PATH }}/Contents/Info.plist 

refs: https://apple.stackexchange.com/questions/350405/unlike-other-folders-dragging-apps-out-of-applications-create-an-alias-what-c https://stackoverflow.com/questions/41964074/gatekeeper-path-randomization-for-developer-signed-dmg