With this commit, we save to a temporary file first and then cat the end
run a copy to overwrite the source file. If the save somehow fails or the
program crashes mid-save, this will prevent the user's project file from
getting corrupted.
Made various changes and fixes to the task system:
- Tasks are built around QtConcurrent rather than QThread. Reduces
code complexity significantly.
- Task error reporting is now streamlined in both TaskManager and
TaskDialog.
- Moved ProjectImport/Save/LoadManager to the app/task folder
itsmattkc