Implements Wall Climbing

* Adds new turf/simulated proc: climb_wall
* * Anyone can attempt this by standing next to wall
* * Untrained have chance to fall
* * Trained dont fall unless interrupted
* * Speed varies wildly depending on gear & skills
* * * Takes lowest climb_delay, multiplies 5 by it
* * * Depending on tresholds, may add 10/5 seconds on top (>1.25, >1.0)
* * Gear can enable even rookies to climb. Simplemobs cant use gear
* * Except scugs. They can specifically use their spears to climb, leaving it behind
* Adds new turf/simulated var: climbable
* * solidrock, /mineral/cave have climbable set to true
* Adds new turf/simulated logic for init, examine() and a yet-unused proc
* * proc toggle_climbability allows turning walls climbable. Useful for GMs!
* * Could also later implement a tool to turn walls climbable when used using it.
* Adds new mob/living vars, can_climb and climbing_delay
* * These are for handling silicons and simple mobs
* Adds new species vars, can_climb and climbing_delay
* * These are for human mobs
* climbing_delay defaults to 1.5
* * Tajara have it at 1.25
* * Vassalian have it at 1
* * Scugs got it at 2.0, reduced to 0.75 when using spear
* New traits: climber; climber, professional; climber, master
* * Cost 0, 1, 2 pts as positive trait respectively
* * Enable safe climbing, reduce delay to 1.25, 1.0 respectively
* moves rock_climber from shoes to items define
* Adds new item var, climbing_delay set at 1

code/game/objects/items.dm

@@ -112,6 +112,9 @@
 
 	var/protean_drop_whitelist = FALSE
 
+	var/rock_climbing = FALSE //If true, allows climbing cliffs using click drag for single Z, walls if multiZ
+	var/climbing_delay = 1 //If rock_climbing, lower better.
+
 /obj/item/New()
 	..()
 	if(embed_chance < 0)