Added 2 rotation algorithms and popup for rotating current layer#143

Merged

OverloadedOrama merged 5 commits intoOrama-Interactive:masterfrom azagaya:master

Feb 4, 2020

+373-60

Commits on Jan 26, 2020

Added functions to rotate image, and added gui for the same purpose
azagaya
committed

Commits on Jan 27, 2020

Rotate layer on confirm added
azagaya
committed

Commits on Feb 3, 2020

Commits on Feb 4, 2020

Fixed bugs detected by overloaded
azagaya
committed