more intuinitve configuration interface in graphicalitem. Improve code
for the future references (in case if new color type will be added).
Change X-AW-*Color values to ones with prefixes (added autoconversion
from old-version api)
Move old chechUpdates() method to this class. Create ability to show
ChangeLog after updates (by using global config with version). Changelog
(only for the latest version) will be written to version.h during cmake
run.