Release Candidate Firmware V1.25 RC5

[vidret]

UPDATE RC5:
- fixed issue if the clock multiplier is set to a high value and stopping that pattern (leads to another 1bpm situation)
- added SHIFT+DOWN+DELETE on sequencer screen to move a column one down (insert empty one). Works also for the insert key on a computer keyboard.

Excellent. I'll try it when that black screen bug is killed too