Established connection from android to desktop using QR-Codes; Added 'exit' functionality (added send exit); added PDF-Library Qoppa; basic presentation control is now enabled. there is still a bug causing a crash (but I don't know why exactly, yet)
tst
added missing files
some more missing
fixed bug; improved UI
Changed from pdf to first draft of picture usage with raw-test-data and basic animations
also removed assets needed for pdf-version
Merge branch 'pdfviewer' into test

Conflicts:
	Presentation-Desktop/.classpath