devel/godot: Update to 2.1 and add minimal devel/godot-tools slave port
- Update to 2.1 release
- Add LICENSE_FILE for MIT license
- Add CCBYv3 license for logo
- Add devel/xdg-user-dirs, devel/xdg-utils and x11/xmessage to RUN_DEPENDS
- Add xrandr to USE_XORG
- Replace USE_OPENSSL=yes with USES+=ssl
- Add gl to USE_GL
- Remove GLU dependency - glu.h was included from imported glew.h
but GLU components are not used
- Add DEBUG option and clarify build targets
- Replace TOOLS option with devel/godot-tools port, while devel/godot
port used as runtime
- Allow to build ALSA and PulseAudio drivers independently
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