Feature: generic logbook

[wenatuhs]

Similar to #10 I would like to run optional additional code with the Logbook button.

why

Some machines have an online logbook. It would facilitate the documentation if Badger GUI can directly send its created file to this logbook

how

Idea: if option "USE_EXTERNAL_LOG" is chosen, call a function from plugins according to machine. Either extend logbook() or send_to_logbook() with the function call

issue: Where to get the current machine. Correct way is a dependency by routine. Especially if multiple logbooks per machine exists. This would be a huge alteration of the badger structure. Other option is a drop-down choice button, where the user can choose the logbook before pressing the button.

EDIT:
The logbook function can be added to interfaces.

From @wyrnat