Add "cut" support about ctrl HOT 2 CLOSED

This feature will require applying some significant changes in the clipboard module. Files that are queued for copying are currently written to a text file. With the introduction of a new mode, the clipboard format has to somehow differentiate between copying and cutting. Several approaches come to mind :

Using two text files, one for copying and one for cutting

Pros :

• Easier implementation since it's just plain text

Cons :

• Juggling with two different clipboards can prove to be problematic

Using a format that would allow me to specify whether files are queued for copying or moving (CSV, XML, JSON, etc.)

Pros :

• Are available in the standard library (except for XML, which is deprecated)

Cons :

• Requires a parser for the chosen format
• I think lookups are going to be linear and/or might require loading the entire clipboard into RAM

Using a SQLite database

Pros :

• It seems like it would be the right tool for the job
• Is probably optimized for this sort of thing

Cons :

• Harder to implement
• Will probably need to use an external library

from ctrl.

Alright so in the end I went with the last option, an SQLite database. It's probably overkill for such a simple program, but oh well.

Impacts of this choice :

• Lookup member functions are no longer const because they call SQLite's prepare function which isn't const
• An additional external dependency
• Increased build times

from ctrl.