MIDI File Fixes for Technical Errors

[curioustorvald]

Related issue: #17

This commit fixes so-called "music is distorted but sometimes" bug observed on Windows, caused by some songs changing MIDI Pitch Bend ranges but it's not being reverted.

In other words, I just added bend range reset commands on every single MIDI file so that they are properly initialised.

Ideally this should be fixed by the sequencer itself — they should reset any parameter changes from previous songs — but it seems Windows MIDI sequencer doesn't do that, and since Microsoft actually fixing any music-related bugs on their product is simply something that would never happen, I thought it would be better to "fix" the MIDI file themselves.