Add trainers to Celadon University, add two new salesmen, etc

Overall completes Celadon University sans a problem with sprites being a bit corrupted until you leave. New Magikarp Salesman-esque events in other pokecenters which is kinda neat

text/CeladonUniversityPokecenter.asm

@@ -0,0 +1,48 @@
+_CeladonUniversityPokecenterText4::
+	text "I think PORYGON"
+	line "should be"
+	cont "improved."
+	
+	para "We need more"
+	line "funding from"
+	cont "SILPH CO.!"
+	
+	done
+
+_CuboneSalesmanText1::
+	text "MAN: Hey there,"
+	line "BIG SHOT TRAINER!"
+	
+	para "Have I got the"
+	line "deal for you!"
+	
+	para "Strike fear into"
+	line "the hearts of"
+	cont "your foes with"
+	cont "CUBONE today!"
+	
+	para "See that skull"
+	line "on its face?"
+	
+	para "Just ¥500! You"
+	line "can't refuse"
+	cont "an offer like"
+	cont "that!"
+	
+	done
+
+_CuboneSalesmanNoText::
+	text "No? It's a"
+	line "limited time"
+	cont "offer, pal!"
+	done
+
+_CuboneSalesmanNoMoneyText::
+	text "You'll need more"
+	line "money than that!"
+	done
+
+_CuboneSalesmanText2::
+	text "MAN: As usual, no"
+	line "refunds!"
+	done