Add ability to edit and delete config entries

[lokijuhy]

You can now edit and delete registered code_sync projects via code_sync --edit <project> and code_sync --delete <project>.

[arcsi1989]

Looks good.
Would it be possible to directly edit one of the configurations?
e.g. code_sync --edit 'test'?
In case of 10 projects, one has to iterate through all of them?

[lokijuhy]

Looks good.
Would it be possible to directly edit one of the configurations?
e.g. code_sync --edit 'test'?
In case of 10 projects, one has to iterate through all of them?

Good point! I changed it so that the user specifies code_sync --edit <project> or code_sync --delete <project>

[arcsi1989]

Looks great. Thank you for making the changes.