a few plugin updates -> plugins can now load files & update images in the viewport & the plugin can decide if it is closed on image changes or not
removed start upnp from sync menu since it does not work using herqq
plugin system is now only enabled on windows systems
get main window added to plugins
browse filters finished - register extensions should still be checked!
added nomacs.cmake.in
cmake fixes for multiple architectures (especially x64)
Merge branch 'developer' of https://github.com/nomacs/nomacs into developer

Conflicts:
	ImageLounge/CMakeLists.txt
cmake fine tuning
Merge remote-tracking branch 'remotes/origin/developer' into plugins