Add test for Grand Staff instruments
Fix instrument names for the same channel
Add test for instrument names of the same channel
Add MIDI import test for grand staff detection
Fix #41011: Wrong instruments in MIDI file
Add MIDI import test for 3 staff organ
Show manual and pedal captions for organ; show instr + track name
Show instruments even for 2nd staff in Grand Staff
Merge pull request #1518 from trig-ger/midi_fixes

Fixes for MIDI import. Instruments with the same channel