Relax jumping requirements

Author: heimskr

src/entity/Entity.cpp

@@ -1468,16 +1468,10 @@ namespace Game3 {
 
 		{
 			auto velocity_lock = velocity.uniqueLock();
-			if (velocity.z != 0.) {
+			if (velocity.z > 0.0) {
 				return;
 			}
 
-			{
-				auto offset_lock = offset.sharedLock();
-				if (offset.z != 0.)
-					return;
-			}
-
 			velocity.z = getJumpSpeed();
 		}
 

src/packet/JumpPacket.cpp

@@ -8,7 +8,7 @@
 
 namespace Game3 {
 	void JumpPacket::handle(const std::shared_ptr<ServerGame> &, GenericClient &client) {
-		if (auto player = client.getPlayer()) {
+		if (ServerPlayerPtr player = client.getPlayer()) {
 			player->jump();
 		} else {
 			client.send(make<ErrorPacket>("No player."));