Add new target to Makefile, which removes the __pycache__ directories

Makefile

@@ -21,14 +21,16 @@ install-ui:
 	popd;
 	@echo 'Installed dependecies for UI'
 
-clean-ui-node-modules:
+remove-ui-node-modules:
 	pushd ${ui_path}; \
 	rm -rf node_modules; \
 	popd;
 
+remove-python-cache-files:
+	find . -type d -name '__pycache__' -exec rm -r {} +
 
-clean: clean-ui-node-modules
-	@echo 'Cleaning...'
-	rm -f *.db *.log
-	rm -f */*.db */*.log
-	@echo 'Cleaned'
+remove-project-cache-files:
+	find . -type f -name '*.log' -exec rm {} +
+	find . -type f -name '*.db' -exec rm {} +
+
+clean: remove-ui-node-modules remove-python-cache-files remove-project-cache-files