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

scripts/CeladonUniversityPokecenter.asm

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+CeladonUniversityPokecenter_Script:
+	call Serial_TryEstablishingExternallyClockedConnection
+	jp EnableAutoTextBoxDrawing
+
+CeladonUniversityPokecenter_TextPointers:
+	dw CeladonUniversityHealNurseText
+	dw CeladonUniversityPokecenterText2
+	dw CuboneSalesmanText
+	dw CeladonUniversityTradeNurseText
+
+CeladonUniversityTradeNurseText:
+	script_cable_club_receptionist
+
+CeladonUniversityHealNurseText:
+	script_pokecenter_nurse
+
+CeladonUniversityPokecenterText2:
+	text_far _CeladonUniversityPokecenterText4
+	text_end
+
+CuboneSalesmanText:
+	text_asm
+	CheckEvent EVENT_BOUGHT_CUBONE, 1
+	jp c, .alreadyBoughtCubone
+	ld hl, .Text1
+	call PrintText
+	ld a, MONEY_BOX
+	ld [wTextBoxID], a
+	call DisplayTextBoxID
+	call YesNoChoice
+	ld a, [wCurrentMenuItem]
+	and a
+	jp nz, .choseNo
+	ldh [hMoney], a
+	ldh [hMoney + 2], a
+	ld a, $5
+	ldh [hMoney + 1], a
+	call HasEnoughMoney
+	jr nc, .enoughMoney
+	ld hl, .NoMoneyText
+	jr .printText
+.enoughMoney
+	lb bc, CUBONE, 17
+	call GivePokemon
+	jr nc, .done
+	xor a
+	ld [wPriceTemp], a
+	ld [wPriceTemp + 2], a
+	ld a, $5
+	ld [wPriceTemp + 1], a
+	ld hl, wPriceTemp + 2
+	ld de, wPlayerMoney + 2
+	ld c, $3
+	predef SubBCDPredef
+	ld a, MONEY_BOX
+	ld [wTextBoxID], a
+	call DisplayTextBoxID
+	SetEvent EVENT_BOUGHT_CUBONE
+	jr .done
+.choseNo
+	ld hl, .RefuseText
+	jr .printText
+.alreadyBoughtCubone
+	ld hl, .Text2
+.printText
+	call PrintText
+.done
+	jp TextScriptEnd
+
+.Text1
+	text_far _CuboneSalesmanText1
+	text_end
+
+.RefuseText
+	text_far _CuboneSalesmanNoText
+	text_end
+
+.NoMoneyText
+	text_far _CuboneSalesmanNoMoneyText
+	text_end
+
+.Text2
+	text_far _CuboneSalesmanText2
+	text_end