Returns the x position of the edge of the screen that is in front the player, in absolute stage coordinates.

Format: FrontEdge

Arguments:

- none

Return type: float

Error conditions: none

Notes:

This trigger is equivalent to the expression "ifelse(facing = 1, RightEdge, LeftEdge)".

Example:

`trigger1 = facing * (Pos X + CameraPos X) < facing * (FrontEdge)
; Triggers if the player is behind the front edge of the screen.`