New triggerevolution script

[FosterProgramming]

New script commant to trigger EVO_SCRIPT_TRIGGER evolutions

Description

Added a new script command that properly handles EVO_SCRIPT_TRIGGER and sets VAR_RESULT according to the result
Waiting for discord discussion to see if we want to keep it as a new command or replace tryspecialevo which is likely not working as intended at the moment

Media

Script used in the video to showcase the different "branches":

OldaleTown_EventScript_Girl::
	//msgbox OldaleTown_Text_SavingMyProgress, MSGBOX_NPC
	lockall
	triggerevolution SPECIES_YAMASK_GALAR
	goto_if_gt VAR_RESULT, 0, YamaskGalarInParty
	msgbox YamaskGalarNotInParty, MSGBOX_NPC
	goto TriggerEvoEnd
YamaskGalarInParty:
	goto_if_gt VAR_RESULT, 1, YamaskGalarDamaged
	msgbox ConditionsUnmet, MSGBOX_NPC
	goto TriggerEvoEnd
YamaskGalarDamaged:
	goto_if_eq VAR_RESULT, 3, YamaskGalarEvolved
	msgbox EvolutionCancelled, MSGBOX_NPC
	goto TriggerEvoEnd
YamaskGalarEvolved:
	msgbox EvolutionSuccesful, MSGBOX_NPC
TriggerEvoEnd:
	releaseall
	end

YamaskGalarNotInParty:
	.string "Yamask Galar is not in party$"

ConditionsUnmet:
	.string "Does not meet evo conditions$"

EvolutionCancelled:
	.string "Yamask Galar did not evolve$"
	
EvolutionSuccesful:
	.string "Yamask Galar evolved$"

evo_script.mp4

Issue(s) that this PR fixes

Fixes #7546

Discord contact info

https://discord.com/channels/419213663107416084/1406308437054193724
Jamie (foster_harmony)