[Merged by Bors] - Expose set_changed() on ResMut and Mut - #2208

[Merged by Bors] - Expose set_changed() on ResMut and Mut#2208

NathanSWard wants to merge 3 commits into

bevyengine:mainbevyengine/bevy:mainfrom

NathanSWard:nward/set-changed-on-mutNathanSWard/bevy:nward/set-changed-on-mutCopy head branch name to clipboard