Brooms, Stick-horses, and Flying Wizards!

A port of https://github.com/d3athrow/vgstation13/pull/4377

![image](http://i.gyazo.com/dd415093be904dc9e5d40570598eddb9.gif)

Allows brooms to be wielded with 2-hands. Doing so places the broom
between your legs so you look like you are riding it.

You can also put a horsehead mask onto the broom to create a stick-horse
to ride. This can also be wielded, but will ALWAYS appear between your
legs.

And for the more magically inclined, wielding a broom or stick-horse (2
hands!) will cause you to ride it like a witch, giving you the ability
to bypass hazards such as tables and banana peels.

code/modules/mob/living/carbon/human/human_movement.dm

@@ -10,6 +10,8 @@
 
 	if (istype(loc, /turf/space)) return -1 // It's hard to be slowed down in space by... anything
 
+	if(flying) return -1
+
 	if(embedded_flag)
 		handle_embedded_objects() //Moving with objects stuck in you can cause bad times.
 
@@ -77,6 +79,11 @@
 	//Can we act
 	if(restrained())	return 0
 
+	//Are we flying?
+	if(flying)
+		inertia_dir = 0
+		return 1
+
 	//Do we have a working jetpack
 	if(istype(back, /obj/item/weapon/tank/jetpack))
 		var/obj/item/weapon/tank/jetpack/J = back

code/modules/mob/living/carbon/human/life.dm

@@ -1034,6 +1034,14 @@ var/global/list/brutefireloss_overlays = list("1" = image("icon" = 'icons/mob/sc
 			if(jitteriness)
 				do_jitter_animation(jitteriness)
 
+			//Flying
+			if(flying)
+				spawn()
+					animate(src, pixel_y = pixel_y + 5 , time = 10, loop = 1, easing = SINE_EASING)
+				spawn(10)
+					if(flying)
+						animate(src, pixel_y = pixel_y - 5, time = 10, loop = 1, easing = SINE_EASING)
+
 			//Other
 			handle_statuses()
 

code/modules/mob/mob_defines.dm

@@ -102,6 +102,7 @@
 	var/drowsyness = 0.0//Carbon
 	var/dizziness = 0//Carbon
 	var/jitteriness = 0//Carbon
+	var/flying = 0
 	var/charges = 0.0
 	var/nutrition = 400.0//Carbon