Make paths relative to application directory

[probonopd]

I am trying to produce an AppImage for avrdude-qt-gui and I am struggling with the fact that paths are hardcoded:

avrdude-qt-gui/qavrdude/settings.cpp

Lines 15 to 17 in b5bb0d0

	dudePath = settingsIni->value("dudePath", "/usr/bin/avrdude").toString();
	xmlsPath = settingsIni->value("xmlsPath", "/usr/share/avrxmls").toString(); // FIXME check avrstudio default installation path
	sqlitePath = settingsIni->value("sqlitePath", "/usr/share/qavrdude/devicedb.sqlite").toString();

needs to be made relative to QCoreApplication::applicationDirPath().

http://doc.qt.io/qt-5/qcoreapplication.html#applicationDirPath

References:

• https://github.com/probonopd/avrdude-qt-gui/blob/patch-1/.travis.yml
• Create qavrdude AppImage/appimage.github.io#1573

[martonmiklos]

Hey,

Feel free to fix and PR and I will accept it.

To be honest, there are a lot of tweaks which needs to be done on the tool itself. I do not remember if I have even tested it with the SQLite backend.