v2019.05.4

Changes

• Refactored and rewrote part of the code to make it more readable, less confusing and more understandable
• Fixed an issue where the translation system was not initialized
• When in volume control mode, control + up/down and control+m adjusts and mute the volume of the currently active application, i.e. chrome if you're in a Chrome web page.
• Fixed License and Copyright informations
• Added License for Pycaw dependency.
• Removed a useless enum.py file.