Methods to play giantbooks and various HUD streaks

[Xalum]

A giantbooks.xml is present in the game's resources, and may work for adding new giantbooks; however with no method in the api to play a giantbook, this xml remains useless except to remove or modify existing giantbooks

While a custom giantbook could be rendered manually, there is no good solution to implement the brief pause caused by vanilla giantbooks, and a custom method that hooks into the game's own giantbook rendering system would be extremely useful

[Meowlala]

Hijacking this to mention other things we should be able to play:

• Custom fortunes
• Custom item name & description streaks
• Custom floor & curse streaks
• Custom achievements
• Custom boss splashes

[Meowlala]

Following HUD animations are now playable in patch:

• Custom fortunes
• Custom item name & description streaks
• Custom floor & curse streaks (although not positionable, so the tab to reveal feature is not reimplementable yet.)

Not included are:

• Custom giantbooks
• Custom achievements
• Custom boss splashes

[TaigaTreant]

The ability to prevent Giantbook animations, or stop queued/playing Giantbook animations, would also be appreciated.