Ice tile and rock

[zapturk]

• added a rock
• Added Ice tile that will slide the player
• you can test in debug room

[DevMichaelV]

Very cool. Just got a chance to look at this. Everything works well!

Feedback:

• Would it be a dev-friendly move to make a pathway to get to the debug levels without changing the code in ZETitle.gd?
• Would it be better if sliding on the ice was smooth and constant until hitting a barrier (e.g., a rock) or solid land?

Non-critical bugs I found
I found and fixed a slight typing issue with line 8 in ZEGate.gd; it was throwing a warning

# Old line - inherit typing from enum
@onready var currentState := state.closed

# New line - explicit typing as int
@onready var currentState: int = state.closed

I added an underscore in front of area on line 115 in ZEPlayer.gd as it was throwing a warning
func _on_ground_check_area_exited(_area: Area2D) -> void: