C64tools

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Some updates done when working on an article about c64 fonts. They mainly include extended possibilities to set colors and multicolor support for char-related methods.

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* Working on the documentation
* added type hints (where possible)
* replaced OptionParser by ArgumentParser
* __some of the options have been transferred to arguments__
* changes in __charset2png.py__
* the option **--quiet** has been replaced by the option **--show**
* changes in __charpacker.py__
* added the option **--show**
* short options for **--screen-output** and **--charset-output** are now named **-S** and **-C**, respectively
* added some tests
* **debugged command line execution after install**

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* Working on the documentation

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* Patched documentation (return types)
* Set proper formatting for [readthedocs](https://c64tools.readthedocs.io/)

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* installing non-library scripts as console applications
* improving setup.py

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* patching / extending documentation