hardcapped xenoarch machinery heat to 177K, made xenoarch machinery only produce heat when scanning, added a couple of missing tools to the gearbelt

Signed-off-by: Cael_Aislinn <cael_aislinn@yahoo.com.au>
Merge pull request #2811 from caelaislinn/xenoarch

Xenoarch tweaks
Merge remote-tracking branch 'upstream/master'