Improved build system with many more (and improved) type hints.

Fixed visible control characters issue on Windows. Fixes #293

Included fix for the progressbar command

Greatly improved Windows (colour) support and fixed several Windows bugs

disabling run-command until it is properly finished

fixed typeerror on Windows thanks to @eachimei, excluded docs from install thanks to @mgorny and added readthedocs configuration file

Added support for multithreading, multiprocessing, colors (16, 256 and full color) and many interactive terminal features such as continuous printing for a live ETA

Added increment() method for easy usage as callback from libraries such as boto

Fixed backwards compatibility with original progressbar library

Delegate unknown attrs to target in WrappingIO thanks to @william-andre. Added threaded progress bar example