Also remove the chdir() to pronterface.py directory

Also install webinterface deps and fix bug in configfile()

Factorize into a single function and support Marlin-style reports

fix custom button drag and drop being broken, with different strategy (1px size) to hide the drag-drop targets when not in use

Make crash in estimation code not block file load.
Diable web interface by default.

printcore - send the initial M105 using _send instead of send_now

send_now can't be used until the printer is online.