Slime ignoring skrell(lore request) (#5710)

Lore request - requested by Sleepy Wolf, and approved by Jackboot. This PR makes slime ignore skrell at all. Lore justification will be posted in PR later.

code/modules/mob/living/carbon/metroid/life.dm

@@ -221,13 +221,16 @@
 				if(isslime(L) || L.stat == DEAD) // Ignore other slimes and dead mobs
 					continue
 
+				if(isskrell(L)) // we do not attack skrell - lore reason.
+					continue
+
 				if(L in Friends) // No eating friends!
 					continue
 
 				if(issilicon(L) && (rabid || attacked)) // They can't eat silicons, but they can glomp them in defence
 					targets += L // Possible target found!
 
-				if(istype(L, /mob/living/carbon/human)) //Ignore slime(wo)men
+				if(ishuman(L)) //Ignore slime(wo)men
 					var/mob/living/carbon/human/H = L
 					if(H.species.name == "Slime")
 						continue

html/changelogs/Sindorman-slime.yml

@@ -0,0 +1,37 @@
+################################
+# Example Changelog File
+#
+# Note: This file, and files beginning with ".", and files that don't end in ".yml" will not be read. If you change this file, you will look really dumb.
+#
+# Your changelog will be merged with a master changelog. (New stuff added only, and only on the date entry for the day it was merged.)
+# When it is, any changes listed below will disappear.
+#
+# Valid Prefixes:
+#   bugfix
+#   wip (For works in progress)
+#   tweak
+#   soundadd
+#   sounddel
+#   rscadd (general adding of nice things)
+#   rscdel (general deleting of nice things)
+#   imageadd
+#   imagedel
+#   maptweak
+#   spellcheck (typo fixes)
+#   experiment
+#   balance
+#################################
+
+# Your name.
+author: PoZe
+
+# Optional: Remove this file after generating master changelog.  Useful for PR changelogs that won't get used again.
+delete-after: True
+
+# Any changes you've made.  See valid prefix list above.
+# INDENT WITH TWO SPACES.  NOT TABS.  SPACES.
+# SCREW THIS UP AND IT WON'T WORK.
+# Also, all entries are changed into a single [] after a master changelog generation. Just remove the brackets when you add new entries.
+# Please surround your changes in  double quotes ("), as certain characters otherwise screws up compiling. The quotes will not show up in the changelog.
+changes:
+  - tweak: "Slimes will now ignore Skrell."