Move from deprecated QtScript to QJSEngine
Remove unused source files.
Merge pull request #97 from Hello71/qjsengine

Move from deprecated QtScript to QJSEngine
Merge pull request #98 from Hello71/unused

Remove unused source files.
Mv etc -> share, use applicationDirPath (fixes #30)

Also build outside of bin.
Add DATADIR, search_paths for game_data.ini