Port medibot + bot spawners from nyano (#9854)

* Port medibot + bot spawners from nyano

* Make the injection thresholds constants

* Remove warning

* Check against const in system too

* resolving systems just isn't worth it

* only resolve entity manager once

* Reduceother resolves too

* fix post-merge

* woops

Resources/Textures/Mobs/Silicon/Bots/medibot.rsi/meta.json

@@ -0,0 +1,15 @@
+{
+   "copyright" : "Taken from https://github.com/tgstation/tgstation",
+   "license" : "CC-BY-SA-3.0",
+   "size" : {
+      "x" : 32,
+      "y" : 32
+   },
+   "states" : [
+      {
+         "directions" : 1,
+         "name" : "medibot"
+      }
+   ],
+   "version" : 1
+}