Makefile: clean and distclean updates

- update clean to recurse all build directories and use build system clean
 - git clean is used to remove submodule generated build artifacts that
are left in the source tree
 - distclean now discards all build directories and any gitignored
filess that were generated in source directories (but not top level)

Makefile

@@ -468,26 +468,27 @@ validate_module_configs:
 .PHONY: clean submodulesclean submodulesupdate gazeboclean distclean
 
 clean:
-	@rm -rf "$(SRC_DIR)"/build
-	@git submodule foreach git clean -df
+	@find "$(SRC_DIR)/build" -mindepth 1 -maxdepth 1 -type d -exec sh -c "echo {}; cmake --build {} -- clean || rm -rf {}" \; # use generated build system to clean, wipe build directory if it fails
+	@git submodule foreach git clean -dX --force # some submodules generate build artifacts in source
 
 submodulesclean:
 	@git submodule foreach --quiet --recursive git clean -ff -x -d
 	@git submodule update --quiet --init --recursive --force || true
 	@git submodule sync --recursive
-	@git submodule update --init --recursive --force
+	@git submodule update --init --recursive --force --jobs 4
 
 submodulesupdate:
-	@git submodule update --quiet --init --recursive || true
+	@git submodule update --quiet --init --recursive --jobs 4 || true
 	@git submodule sync --recursive
-	@git submodule update --init --recursive
+	@git submodule update --init --recursive --jobs 4
 
 gazeboclean:
 	@rm -rf ~/.gazebo/*
 
 distclean: gazeboclean
-	@git submodule deinit -f .
-	@git clean -ff -x -d -e ".cproject" -e ".idea" -e ".project" -e ".settings" -e ".vscode"
+	@git submodule deinit --force $(SRC_DIR)
+	@rm -rf "$(SRC_DIR)/build"
+	@git clean --force -X "$(SRC_DIR)/msg/" "$(SRC_DIR)/platforms/" "$(SRC_DIR)/posix-configs/" "$(SRC_DIR)/ROMFS/" "$(SRC_DIR)/src/" "$(SRC_DIR)/test/" "$(SRC_DIR)/Tools/"
 
 # Help / Error
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