Block scripts and triggers: data model, Rhai translation and runtime

Editor missions keep a painted map or roll a random map per campaign run,
leave out goals they cannot have, and run their triggers in the fixed step.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

lang/es.lang

@@ -883,6 +883,8 @@ msg.tool_research = Aún no investigado: las criaturas que estudian en la biblio
 msg.script = {0}
 msg.script_objective = Objetivo: {0}
 msg.script_error = Error de script: {0}
+msg.script_hint = Dedotuerto: {0}
+msg.mission_start_custom = Misión: {0}
 msg.script_language = Lenguaje de script de misión no admitido: {0}
 
 # spells