- added a new package to be installed in Linux to make available the black theme for FlatCAM beta

- moved all the 'share' resources (icons) to the 'assets/resources' folder
- some more fixes to problems generated by latest changes in the open handlers
- modified the make_freezed.py script for the new location of the icons
- added a fix for the ConnectionRefusedError in Linux that is issued when first running after a FlatCAM crash

setup_ubuntu.sh

@@ -8,6 +8,7 @@ sudo apt-get install -y \
 	libgeos-dev \
 	libpng-dev \
 	libspatialindex-dev \
+	qt5-style-plugins \
 	python3-dev \
 	python3-gdal \
 	python3-pip \