And it does what you'd expect it to! Only dictionary search available at
the moment.

This is to prevent things such as sleep mode from printing anything on
the display when the reader is in USB MS.

Really, I could've just checked the battery state to know whether an USB
cable was plugged in...

(and I'm strongly hoping that it will continue like that too ;p)

Some spacer widgets are not required anymore because of the new
QTextEdit.

All's working! (Except maybe some layout shenaningans)

I still need to do some work, but it's ready to be merged into master.

Also, I fixed a dictionnary lookup issue where searching words in all
caps was impossible.