API Documentation: `SMODS.Sticker`

Required parameters:
- key
- loc_txt or localization entry (reference)
Optional parameters (defaults):
- atlas = 'stickers', pos = { x = 0, y = 0 } (reference)
- badge_colour: Colour of this sticker's badge.
- hide_badge: If set to true, no badge is shown for this sticker.
- default_compat: Default compatibility with cards. If true, all cards can have this sticker unless otherwise specified.
- compat_exceptions: Array of keys of centers that have non-default compatibility with this sticker.
  - default_compat = true: sticker cannot be applied to centers in compat_exceptions
  - default_compat = false: sticker can only be applied to centers in compat_exceptions
- sets, list of pools that this sticker is allowed to be applied on, format:
```
 	{
 		Joker = true
 	}
```
- rate = 0.3: Chance of the sticker applying on an eligible card
- needs_enable_flag: If set to true, this sticker requires G.GAME.modifiers['enable_'..self.key] to be true before it can be applied.

API methods

calculate(self, card, context) (reference)
loc_vars (reference)
- Due to some constraints, the functionality of loc_vars on stickers is limited. Out of all possible return values, only vars, key and set are supported.
should_apply(self, card, center, area, bypass_roll) -> bool
- Returns true if the sticker can be applied to the card.
- bypass_roll skips the RNG check and only looks for compatibility
apply(self, card, val)
- Handles applying and removing the sticker
- Sets card.ability[self.key] to val by default.
draw(self, card, layer)
- Draws the sprite and shader of the sticker.