[Improvements] Implement emergency recovery mode for swapfile.

[CryoByte33]

If the swap resize is stopped in the middle of resizing, the swap file will be invalid and cause crashes on further attempts. Add an "emergency recovery" into CU to facilitate the creation of a new swap file.

• Make it of configurable location
• Create it with a configurable size
• Only allow in the case of no swap file being present, to prevent several swap locations

[CryoByte33]

Recommended implementation:

Check for swap size on launch.

• If there's a partition, just say no operating on it
• If there's nothing in the /proc/swaps file, then look for /home/swapfile, if it exists, then it must be malformed.
  • In this case, prompt the user, saying that we detected an issue with the file, and ask if they want to recover from it
• If there's a swapfile present in /proc/swaps, continue as usual

[CryoByte33]

This should be fixed with #100