Port changes:
* Take maintainership
* Change to DISTVERSION
* Add swig30 to BUILD_DEPENDS
* Sort and add to LIB_DEPENDS
* Add lua and python to USES
* Change GH_ACCOUNT to developer's account
* Sort USE_QT5
* Add to and sort USE_XORG
* Remove unnecessary INSTALLS_ICONS
* Remove unnecessary patch of -ldl in Linux-only code
* Now works with any python version 3.4+
* Now scripting works via python and lua
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