Commit Briefs
added load and save command
Saving is straightforward: dump to a file the location and some property of the objects. Loading also is simple: just read all the data and apply it (with some sanity check tho.)
added config file
only the PROMPT is configurable as of now tho.
use par->tag instead of par->obj->tags[0]
par->tag is what the user typed, that may or may not be equal to par->obj->tags[0]. This improves the consistency. That code was written prior to the introduction of the struct param and thus used object->tags.
fix header order for readline
readline needs stdio.h included, but before itself. Change needed after the recent clang-format