message: Add makefile lint rules
  Add lint rules to the makefile using cppcheck and cppclean.
  This rules are largely copied from the NAS2D submodule, with some
  updates for include directories and exclude directories for problem
  code that would crash cppclean.
diff: @@ -58,3 +58,15 @@ clean:
  clean-all:
  -rm -rf $(BUILDDIR)
  -rm -f $(EXE)
  +
  +
  +.PHONY: lint
  +lint: cppcheck cppclean
  +
  +.PHONY: cppcheck
  +cppcheck:
  + cppcheck --quiet "$(SRCDIR)"
  +
  +.PHONY: cppclean
  +cppclean:
  + cppclean --quiet --include-path "$(NAS2DINCLUDEDIR)" --include-path "/usr/include/SDL2" --exclude "MicroPather" "$(SRCDIR)"
  