* removed from component cache
* kept renamed component caches as stubs for later usage
refs #646, removed gui state cache as it causes build issues on Jenkins
(idea was to keep the classes as stubs for later usage)
* removed iconForModel from interface and aircraft config parser
* CPixmap support for loading pixmap from file
* Access to model of model set loader by model string
* icon path as member of CAircraftModel
* moved caches to blackmisc
* used CModelCaches in loader
* applied changes in simulator specific loader classes
* renamed find function to findFirstByModelStringOrDefault
* made merge function static so it can be used elsewhere
The warning message is there in order to tell developers that one of the
rare cases not yet implemeneted were called. This should not cause
the application to stop.
refs #574, #582
Before this change, the model strings were assembled via some
relatives pathes - long and very hard to read. Now it is assembled
via the pattern
<package root dir> <dir> ... <objectname> <texturename>
<package root dir> = the parent directory of xsb_aircrafts.txt
<dir> ... = directory hierarchy down to the object file
refs #574
