Autosave name generation causing error in some directory #557
Description
The autosave name is naively generated by simply replacing the .yafc like below
filename.Replace(".yafc", $"-autosave-{saveIndex}.yafc")
This causes issue when you save to a path that contains that string, for example if i create a project in ~/.yafc/project.yafc, a DirectoryNotFoundException will be triggered because it tried to save into ~/-autosave-1.yafc/project-autosave-1.yafc which obviously doesn't exist.