Fix UI unit tests: they must use/be linked to "she" library.
Fix link problem with gcc compiler and loadpng library.
Merge branch 'dev'
Merge branch 'dev'
Fix algofill.cpp and rotate.cpp files to refer to the correct license.
Do not include loadpng library in the tarball
Do not include scripts folder in the tarball
Fix a typo in all files distributed under BSD-like and Allegro licenses

Thanks to Tobias Hansen.
Fix FTBFS with --as-needed linker option
Libraries must be placed after object files in command line.
More information: https://bugs.gentoo.org/show_bug.cgi?id=445814
Merge branch 'dev'

Conflicts:
	src/CMakeLists.txt
	src/ui/region.cpp
	src/ui/region.h
	src/undo/undo_config_provider.h