observers can become mice, strange ore can be picked up in ore boxes/satchels, crates and closets can be built out of plasteel, changelog update

Signed-off-by: Cael_Aislinn <cael_aislinn@yahoo.com.au>
empty guns play a "click" sound

Signed-off-by: Cael_Aislinn <cael_aislinn@yahoo.com.au>
minor tweaks and cleanup with events, readded meteor shower and grid check events, removed most unused event files (left some interesting ones)

Signed-off-by: Cael_Aislinn <cael_aislinn@yahoo.com.au>