Merge branch 'develop'
Merge branch 'develop'
Reverted deploy make target which cannot be overridden in Linux/qmake
Configuration of Windows installation
new release candidate: 0.9.4
fixed current played media filename retrieval
docker build image compiles qt5.15.3 from source; docker test image supports playing mp3 file; linuxdeploy tool replaces linuxdeployqt
Required min QT version is 5.13.3