version 1.3.1

napiprojekt3 XML API support implemented
napiprojekt3 API as default engine (legacy mode still supported using --id pynapi or --id other)
implemented media nfo retrieval from napi xml (napiprojekt3 API)
implemented cover support using napi xml (napiprojekt3 API)
fps detection using ffprobe + ffmpeg fps detection fixes
subotage.sh reimplemented and code cleaned up
fab support removed from subotage
napi and subotage code integration
extraction of common code to the napi_common.sh library
unit tests for napi and subotage
system tests for napi and subotage
a lot of bugfixes and corrections
napi bundle installer introduced
many fixes to subotage format processing
added logoverwrite option to napi