Add working steamsockets connection and basic lobby UI

- Spawn players, albeit 1 too many (which should be fixed in #615 instead)
- Add basic scene changing

Assets/Prefabs/Gamestate/StaticInfo.prefab

@@ -131,7 +131,7 @@ MonoBehaviour:
   m_PrefabInstance: {fileID: 0}
   m_PrefabAsset: {fileID: 0}
   m_GameObject: {fileID: 8579357797008554893}
-  m_Enabled: 0
+  m_Enabled: 1
   m_EditorHideFlags: 0
   m_Script: {fileID: 11500000, guid: 4dd7fdde42a0f964bb7c193db486410a, type: 3}
   m_Name: 
@@ -177,7 +177,7 @@ MonoBehaviour:
   m_PrefabInstance: {fileID: 0}
   m_PrefabAsset: {fileID: 0}
   m_GameObject: {fileID: 8579357797008554893}
-  m_Enabled: 0
+  m_Enabled: 1
   m_EditorHideFlags: 0
   m_Script: {fileID: 11500000, guid: e6e55fca1f4e4844593a3dd65a3ecb39, type: 3}
   m_Name: 

Assets/Prefabs/Input/PlayerInput.prefab

@@ -14,6 +14,7 @@ GameObject:
   - component: {fileID: 8900440296297243362}
   - component: {fileID: 8358913396528462008}
   - component: {fileID: 8589831862746193968}
+  - component: {fileID: 2624657523749747144}
   m_Layer: 0
   m_Name: PlayerInput
   m_TagString: Untagged
@@ -111,7 +112,7 @@ MonoBehaviour:
   m_PrefabInstance: {fileID: 0}
   m_PrefabAsset: {fileID: 0}
   m_GameObject: {fileID: 3554710591539111231}
-  m_Enabled: 0
+  m_Enabled: 1
   m_EditorHideFlags: 0
   m_Script: {fileID: 11500000, guid: 8ff3ba0becae47b8b9381191598957c8, type: 3}
   m_Name: 
@@ -155,6 +156,23 @@ MonoBehaviour:
   syncInterval: 0.1
   clientAuthority: 1
   animator: {fileID: 0}
+--- !u!114 &2624657523749747144
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 3554710591539111231}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 9b91ecbcc199f4492b9a91e820070131, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: 
+  sceneId: 0
+  _assetId: 2241987887
+  serverOnly: 0
+  visibility: 0
+  hasSpawned: 0
 --- !u!1 &4578288573561392664
 GameObject:
   m_ObjectHideFlags: 0