Update 1.8

A long time has passed since update 1.7, which is an update that never worked.
Here is a build that actually works!

• Now has a status display in the progress area, showing what the merger is doing.
• Fixed crashes
• Added a MIDI info checker

Known bugs to be fixed:
• Writer writes random notes at the start of the midi, cause is unknown.
• resetState hardly ever works
• Missing notes