FlightGear - Flight Simulator FGAddon

* Models/Instruments/instrument-filters.xml: move the filters driving the various radios to...
* Models/Instruments/ADF-462/ctl62-adf-filters.xml,
Models/Instruments/VHF-22/ctl22-com1-filters.xml,
Models/Instruments/VHF-22/ctl22-com2-filters.xml,
Models/Instruments/VIR-32/ctl32-nav1-filters.xml,
Models/Instruments/VIR-32/ctl32-nav2-filters.xml: ... here.
This makes these instruments more self-contained for possible inclusion in fgdata.

* Citation-II-common.xml: load the filters from the above new files. Bump version number.

* rename Models/Instruments/ADF-462/ctl-62.png -> Models/Instruments/ADF-462/ctl62_grey.png
* rename Models/Instruments/TDR-94/ctl-92.png -> Models/Instruments/TDR-94/ctl92_grey.png
* rename Models/Instruments/VHF-22/ctl-22.png -> Models/Instruments/VHF-22/ctl22_grey.png
* Models/Instruments/VHF-22/ctl22_black.png: new.
* rename Models/Instruments/VIR-32/ctl-32.png -> Models/Instruments/VIR-32/ctl32_grey.png

* Models/Instruments/ADF-462/ctl62.ac,
Models/Instruments/TDR-94/ctl92.ac,
Models/Instruments/VHF-22/ctl22.ac,
Models/Instruments/VIR-32/ctl32.ac: improve; rename textures.

* Models/Instruments/ADF-462/ctl62-adf.xml,
Models/Instruments/TDR-94/ctl92-transponder.xml,
Models/Instruments/VHF-22/ctl22-com1.xml,
Models/Instruments/VHF-22/ctl22-com2.xml,
Models/Instruments/VIR-32/ctl32-nav1.xml,
Models/Instruments/VIR-32/ctl32-nav2.xml,
Models/Instruments/panel-layout1.xml: adjust per the above.

Another contribution by Sascha Reißner.