in can_dig (e.g. if it's a technic quarry or something)

Closes #330

This pull checks for mesecons_mvps mod and adds the item frame and
pedestal items to the list of non-movable items so that players cannot
exploit the double-item glitch.

mesecons_mvps added to depends.txt file for this to work.

There's no actual code changes here.

A quick edit to drop items from an itemframe or pedestal when dug instead of removing them, also a fix for the abm to update pedestals properly...

* remove all trailing whitespaces
* make inbox and computer use the prevalent indentation rules
* CRLF->LF where found

with fixes by me, see
https://github.com/VanessaE/minetest-itemframes