Movement and input related mappings (#492)

- Reasoning for updateVelocity/travel naming: https://github.com/FabricMC/yarn/pull/485#issuecomment-465793034
- PlayerLookC2SPacket -> PlayerInputC2SPacket
  + There's no look information in this packet, only info related to the movement keys the player is pressing
  + PlayerLookC2SPacket.yaw -> PlayerInputC2SPacket.sideways
  + PlayerLookC2SPacket.pitch -> PlayerInputC2SPacket.forward
- Mapped Input.movementSideways/Input.movementForward fields and adding 'pressing' prefix to the boolean Input.forward/back/right/left fields

mappings/net/minecraft/client/input/Input.mapping

@@ -1,8 +1,11 @@
 CLASS dfr net/minecraft/client/input/Input
-	FIELD c forward Z
-	FIELD d back Z
-	FIELD e left Z
-	FIELD f right Z
+	FIELD a movementSideways F
+	FIELD b movementForward F
+	FIELD c pressingForward Z
+	FIELD d pressingBack Z
+	FIELD e pressingLeft Z
+	FIELD f pressingRight Z
 	FIELD g jumping Z
 	FIELD h sneaking Z
 	METHOD a tick ()V
+	METHOD b getMovementInput ()Lcnj;

mappings/net/minecraft/entity/Entity.mapping

@@ -96,6 +96,11 @@ CLASS ahl net/minecraft/entity/Entity
 		ARG 3 tickDelta
 	METHOD a setRotation (FF)V
 		ARG 1 yaw
+	METHOD a updateVelocity (FFFF)V
+		ARG 1 movementInputSideways
+		ARG 2 movementInputUp
+		ARG 3 movementInputForward
+		ARG 4 movementSpeed
 	METHOD a damage (Lagv;F)Z
 		ARG 1 source
 		ARG 2 amount

mappings/net/minecraft/entity/LivingEntity.mapping

@@ -16,8 +16,12 @@ CLASS ahu net/minecraft/entity/LivingEntity
 	FIELD bF lastAttackedTime I
 	FIELD bG attacking Lahu;
 	FIELD bH lastAttackTime I
+	FIELD bI movementSpeed F
 	FIELD bK absorptionAmount F
 	FIELD b LOGGER_LIVING Lorg/apache/logging/log4j/Logger;
+	FIELD bg movementInputSideways F
+	FIELD bh movementInputUp F
+	FIELD bi movementInputForward F
 	FIELD bs activeItemStack Laxw;
 	FIELD bw STUCK_ARROWS Lpx;
 	FIELD by attributeContainer Lain;
@@ -33,6 +37,10 @@ CLASS ahu net/minecraft/entity/LivingEntity
 	METHOD C attack (Lahl;)Z
 	METHOD D pushAway (Lahl;)V
 	METHOD E canSee (Lahl;)Z
+	METHOD a travel (FFF)V
+		ARG 1 movementInputSideways
+		ARG 2 movementInputUp
+		ARG 3 movementInputForward
 	METHOD a swingHand (Lagg;)V
 	METHOD a setStackInHand (Lagg;Laxw;)V
 		ARG 1 hand
@@ -67,6 +75,7 @@ CLASS ahu net/minecraft/entity/LivingEntity
 	METHOD cN getSoundPitch ()F
 	METHOD cP getJumpVelocity ()F
 	METHOD cQ jump ()V
+	METHOD cT getMovementSpeed ()F
 	METHOD cV doPushLogic ()V
 	METHOD cW isUsingRiptide ()Z
 	METHOD cY getAbsorptionAmount ()F
@@ -106,6 +115,8 @@ CLASS ahu net/minecraft/entity/LivingEntity
 	METHOD m damageShield (F)V
 	METHOD m setDespawnCounter (I)V
 	METHOD n initAi ()V
+	METHOD n setMovementSpeed (F)V
+		ARG 1 movementSpeed
 	METHOD n getFallSound (I)Lxy;
 	METHOD o setStuckArrows (I)V
 	METHOD p setAbsorptionAmount (F)V

mappings/net/minecraft/network/listener/ServerPlayPacketListener.mapping

@@ -45,7 +45,7 @@ CLASS nj net/minecraft/network/listener/ServerPlayPacketListener
 		ARG 1 packet
 	METHOD a onClientCommand (Log;)V
 		ARG 1 packet
-	METHOD a onPlayerLook (Loh;)V
+	METHOD a onPlayerInput (Loh;)V
 		ARG 1 packet
 	METHOD a onRecipeBookData (Loi;)V
 		ARG 1 packet

mappings/net/minecraft/server/network/packet/PlayerInputC2SPacket.mapping

@@ -0,0 +1,14 @@
+CLASS oh net/minecraft/server/network/packet/PlayerInputC2SPacket
+	FIELD a sideways F
+	FIELD b forward F
+	FIELD c jumping Z
+	FIELD d sneaking Z
+	METHOD <init> (FFZZ)V
+		ARG 1 sideways
+		ARG 2 forward
+		ARG 3 jumping
+		ARG 4 sneaking
+	METHOD b getSideways ()F
+	METHOD c getForward ()F
+	METHOD d isJumping ()Z
+	METHOD e isSneaking ()Z

mappings/net/minecraft/server/network/packet/PlayerLookC2SPacket.mapping

@@ -1,14 +0,0 @@
-CLASS oh net/minecraft/server/network/packet/PlayerLookC2SPacket
-	FIELD a yaw F
-	FIELD b pitch F
-	FIELD c jumping Z
-	FIELD d sneaking Z
-	METHOD <init> (FFZZ)V
-		ARG 1 yaw
-		ARG 2 pitch
-		ARG 3 jumping
-		ARG 4 sneaking
-	METHOD b getYaw ()F
-	METHOD c getPitch ()F
-	METHOD d isJumping ()Z
-	METHOD e isSneaking ()Z