Some more intermission features for Lua

totally not using this to create something

• Allows Lua to disable the emeralds in the Special Stage intermission from rendering.
• Allows Lua to disable the title card font text that renders in Co-op and Special Stage intermissions.,
• Sends IntermissionThinker and intermission hud hooks the stagefailed variable (always false outside of Special Stages)
• This kinda stretches the definition of "intermission" feature, but I also added level title font drawing capabilities too, with a height and width function to boot.