bumping up manifest version
proper cleanup routine for port handler

its very likely there might an left over bug in the port handler which
for some reason skips the disconnected port in certain state, needs more
investigating
port handler bugfixes (might need more)
bugfixes for the spectrum analyzer mode
moving array_difference to PortHandler methods
FW v3.5.5
routine update of fw version and changelog
updating firmware changelog
removing debug flag requirement for PortHandler
polish debug messages