Refactor: moved steamcmd.py to `srcds` package
Refactor: split command-line interface from `srcds.steamcmd` into scripts folder
Refactor: migrate from `docopt` to `click`-based command-line interface
Refactor: use click to colorize output instead of hardcoded ANSI escape
Add: setup.py script for proper packaging via setuptools
Fix: logging config not specified when launched through setuptools generated steamcmd.py wrapper
Fix: --validate option not respected for steamcmd.py
Merge branch 'feature/click' into develop