Autosave & Better Character Editing

Three significant improvements for this release:

- Autosave! Every minute Campaign Manager will automatically save an in-progress unsaved campaign to a separate autosave file. Windows crashes or computer loses power? The next time Campaign Manager starts it will recognize it wasn't closed cleanly, and it will ask the user if unsaved changes should be loaded.

- Added ability to modify SRD 5.1 style Character Sheets directly on the form including combat evaluation values. It is now significantly easier to create a new asset from one of the existing, tweak it, and update abilities for evaluation.

- Added snap to offset positions when dragging encounters and regions around so it's easier to have a clean and organized layout.