Version 4.0.0

This changelog will contain the changelog of v3.0.0 as well.

+ Changed some note names, see the updated wiki page for more info.
+ Removed Mojang's hardcoded sound pitch limit, using the same Mixins that are present in Unweaver.
+ Added two new octaves, Octave 0 and Octave 3 (see the updated wiki page for more info).
+ Added the two new octaves' notes to songsounds:c_major_scale