Genmq

Enhanced the XML file splitter & removed a bug wherein a single question was omitted.

See `genmq --help` for more.

**Full Changelog**: https://github.com/ccaprani/genmq/compare/v0.4...v0.6

- [Add XML merge mode](https://github.com/ccaprani/genmq/commit/ee0063c255d9eb8d9f81b61156cbc72d28347ffe)
- [Added compilation of single question at index i](https://github.com/ccaprani/genmq/commit/d840b9787ce767068d0e12ea3394f9bb17437c31)
- [src layout modifcation for setuptools](https://github.com/ccaprani/genmq/commit/fd84d2b88f693528b84346e1d5589e13bd832cba)
- [bugfix: Splitter - write final file](https://github.com/ccaprani/genmq/commit/1946bf842b6298f9f93c77ecae15f0aa73425b7e)

First release of `genmq` for PyPi.

- `genquiz` renamed to `genmq`
- Code refactored to classes
- Added XML splitter `-s`
- Added cool progress bars (`tqdm`)
- Added `-n` "number" argument for easy test runs
- Added `-l` logging argument for the latex output
- Added optional warning if overwriting existing XML quiz file `-w`
- Improved file/directory path handling
- Installs as command `genmq` on system
- Much more...