By default the vdr-dxr3-plugin does not load the fw automatically any more, as
on recent linux systems the fw gets loaded when the em8300 driver module
gets loaded. So we dont need to load the fw. But for older systems there is the
command option -f/--firmware-loading to tell the plugin to load the firmware at
startup.

The basic idea behind this commit is to get rid of those bad looking
getters and setters, where we have no logic used by them.