Improve testing framework

Replaced Criterrion with CMock. Added few tests, currently not working
properly. Random test upgrades.

dependencies.dep

@@ -23,3 +23,7 @@ tag = master
 [FreeType]
 dl_url = https://download.savannah.gnu.org/releases/freetype/freetype-2.10.0.tar.gz
 custom_commands = tar -xf FreeType && mv freetype-2.10.0 freetype && rm FreeType && cd freetype && cmake -E make_directory build && cmake -E chdir build cmake -D BUILD_SHARED_LIBS:BOOL=true .. && cmake --build build
+
+[CMock]
+git_url = https://github.com/throwtheswitch/cmock.git
+custom_commands = cd cmock && bundle install