[MU4 Issue] Add new instruments incl. bagpipes and Chinese orchestral

Describe the bug
Instruments that aren't native to the instrument list in musescore aren't displayed in the mixer when added to a score, no matter if it is in the instrument list 1 or 2 space.

To Reproduce
Steps to reproduce the behavior:

1. make a custom instrument that doesn't use the name of any of the "vanilla" instruments
2. load the instrument list into musescore
3. add the instruments to musescore (here, i added the flute to show "vanilla" instruments are still showing correctly)
4. open the mixer

Expected behavior
Every instrument in your score should be in the mixer. The fact that they aren't make it so they don't produce any playback sound.

Screenshots

Platform information

• OS: Windows 7

Additional context
I modified the instrument list to add a lot of lacking or obscure instruments that i use a lot in my writing. I'd be glad if the instruments i made code for could be added to musescore, i'd be willing to share them for free.