set fuse timer to match template
show new state when grenade is (de)activated

if you activate a grenated and explicitly set a timer, the ui is
automatically refreshed and the grenade is visibly shown as primed.
this commit applies that behavior to grenades that get primed with just
a r-click (like proximity grenades) and to all grenades when unprimed
with a r-click.
Merge pull request #900 from myk002/copy_paste_primed_items

Copy paste primed items