Cmakelint

- return error code 0, 1, 32 on error

- fix version number

- individual CMake files can control filters with ` lint_cmake: pragma` comment
- improved `SetFilters` function to allow spaces around the commas
- use `${XDG_CONFIG_HOME}` for the cmakelintrc file, with backwards compatible check for `~/.cmakelintrc`

- Published on pypi

- Moved to github