Feature: Pasting multiple /add commands

[jchavannes]

Support pasting multiple /add file commands. For example, if you have the following:

/add file1.ext
/add file2.ext
/add file3.ext

It would be nice to be able to copy this and paste into aider and have it add the 3 files.

Currently if you try this you get this message:

No files matched '/add'. Do you want to create /add? (Y)es/(N)o [Yes]: n

Bonus if you could comment out lines, e.g.

/add file1.ext
# /add file2.ext
/add file3.ext

If you paste that it would only add file1 and file3. This makes it easier to use /drop and comments to switch which files are added.

Currently you can use:

/add
    file1.ext
    file2.ext
    file3.ext

But if you keep that in a text file you can't easily copy 2+ files, e.g. file2 and file3 (excluding file1) and add them without having to manually prefix them with /add.