fixes an overwritten fusion reaction, fixes typo on id computer, makes transit tubes traversible, makes conveyor switches access protected

Signed-off-by: Cael Aislinn <cael_aislinn@yahoo.com.au>
tweaks and reworks much of xenoarch including new content and streamlining/cutting down on old content, removes much unused and old content, slight remap of research outpost (see changelog for more details)

Signed-off-by: Cael Aislinn <cael_aislinn@yahoo.com.au>
changelog update

Signed-off-by: Cael Aislinn <cael_aislinn@yahoo.com.au>
Merge pull request #3839 from caelaislinn/xenoarchaeology

Xenoarchaeology updates