Fix detection of short and long keystrokes from underyling framework

[pre-martin]

This project uses https://github.com/GeekyEggo/SharpDeck as communication framework with Stream Deck.

The SharpDeck framework has built in support for detecting short and long keystrokes. Unfortunately, the logic is broken so that a sequence of fast short keystrokes is interpreted as long keystrokes. I opened the ticket GeekyEggo/SharpDeck#18, which describes the issue.

Blocks: #63

Decision: I will implement my own logic for detection of short and long keystrokes.