Un-scale HUDs for micros and macros.

* Set appearance_flags on HUD images to prevent them from being scaled up/down when the owning mob is macro/micro.
* Optimized the resize() proc and made it adjust the vertical position of the unscaled hud to stay even with the top of the mob's head.
* Also fix the resize proc to be consistent with update_icons().   Now micros wont be in the middle of a turf temporarily after resizing.

code/modules/resleeving/designer.dm

@@ -287,7 +287,7 @@
 	H.dna = R.dna.Clone()
 	H.UpdateAppearance() // Update all appearance stuff from the DNA record
 	H.sync_organ_dna() // Do this because sprites depend on DNA-gender of organs (chest etc)
-	H.size_multiplier = active_br.sizemult
+	H.resize(active_br.sizemult, FALSE)
 
 	// And as for clothing...
 	// We don't actually dress them! This is a medical machine, handle the nakedness DOCTOR!

code/modules/resleeving/machines.dm

@@ -88,7 +88,7 @@
 	//Basically all the VORE stuff
 	H.ooc_notes = current_project.body_oocnotes
 	H.flavor_texts = current_project.mydna.flavor.Copy()
-	H.size_multiplier = current_project.sizemult
+	H.resize(current_project.sizemult, FALSE)
 	H.weight = current_project.weight
 	if(current_project.speciesname)
 		H.custom_species = current_project.speciesname
@@ -301,7 +301,7 @@
 	//Basically all the VORE stuff
 	H.ooc_notes = current_project.body_oocnotes
 	H.flavor_texts = current_project.mydna.flavor.Copy()
-	H.size_multiplier = current_project.sizemult
+	H.resize(current_project.sizemult)
 	H.weight = current_project.weight
 	if(current_project.speciesname)
 		H.custom_species = current_project.speciesname