Ui fixes (#643)

* Fix foldouts not retaining states between play mode & editor.

* Don't allow empty names for layer visualizers.

* Add defaults for all sublayer properties to not carry over any options from the previous layer.

* Add missing tooltips.

* Fix indentation.

* Update tooltip for Extent Type.

* Add tooltips for prefix labels for dropdowns.

* Change `Style Name` to `Data Source`

* Fix typo in colorPalette.

* Selected newly created layer visualizer.

* Update scenes with missing ScriptablePalette.

* Update tooltip for min/max height extrusion.

* Updated scene.

* Update tooltip of sampleCount

* Update scene after merge with develop

* Fix scene, indentation for collider type.

* Update scene with collider options.

Author: abhishektrip

sdkproject/Assets/Mapbox/Examples/0_PrefabScenes/CitySimulator.unity

@@ -279,6 +279,12 @@ Prefab:
       propertyPath: m_RootOrder
       value: 2
       objectReference: {fileID: 0}
+    - target: {fileID: 114196496685157712, guid: 5bb46bae81bf04608ac699be504c5e66,
+        type: 2}
+      propertyPath: _vectorData._layerProperty.vectorSubLayers.Array.data[0].materialOptions.colorPalette
+      value: 
+      objectReference: {fileID: 11400000, guid: ef118b5e263da4b1fa4327ca1d3e0c7b,
+        type: 2}
     m_RemovedComponents: []
   m_ParentPrefab: {fileID: 100100000, guid: 5bb46bae81bf04608ac699be504c5e66, type: 2}
   m_IsPrefabParent: 0