Ut 3671 update docs for using fbxsdk runtime (#546)

* update FBX SDK bindings dependency + docs

* small clarification to changelog

Author: vkovec

CHANGELOG.md

@@ -7,11 +7,15 @@
     - When modifying the settings in the Export/Convert to Prefab windows, the Project Settings are no longer updated, but the changes persist for the remainder of the Unity session.
 - Disable buttons such as the "Install Integration" button when editing an FBX export setting preset.
 - Rename "Show Convert UI" in project settings to "Display Options Window" and use it for both the Convert and Export windows instead of just the Convert to Prefab window.
+- Made FBX SDK bindings Editor only so they are not copied into builds by default. In order to use at runtime, 
+  add the FBXSDK_RUNTIME define to Edit > Project Settings... > Player > Other Settings > Scripting Define Symbols.
 
 ### Fixed
 - Fix Export Model and Convert to Prefab Variant setting presets not serializing settings properly.
 - Fix NullReferenceException when modifying a preset for the FBX export settings in Edit > Project Settings > Fbx Export.
 - Fix error in an export when the project settings are not writeable (e.g. if you're using Perforce).
+- FBX SDK bindings no longer included in builds, fixing an issue with shipping on the Mac App Store.
+
 
 ## [3.2.1-preview.2] - 2020-08-05
 ### Added

com.unity.formats.fbx/Documentation~/devguide.md

@@ -24,6 +24,8 @@ public static void ExportGameObjects(Object[] objects)
 
 The FBX SDK bindings can be executed during gameplay allowing import and export at runtime. Currently a custom importer/exporter needs to be written in order to do so, as the FBX Exporter is Editor only.
 
+> **NOTE:** The FBX SDK bindings are Editor only by default and will not be included in a build. In order for the package to be included in the build, add the FBXSDK_RUNTIME define to Edit > Project Settings... > Player > Other Settings > Scripting Define Symbols.
+
 ### Basic Exporter:
 
 ```
@@ -84,4 +86,4 @@ protected void ImportScene (string fileName)
 
 ### Limitations
 
-* Only 64 bit Windows and MacOS standalone player builds are supported
+* Only 64 bit Windows, MacOS and Ubuntu standalone player builds are supported

com.unity.formats.fbx/package.json

@@ -5,7 +5,7 @@
   "dependencies": {
     "com.unity.recorder": "2.2.0-preview.4",
     "com.unity.timeline": "1.0.0",
-    "com.autodesk.fbx": "3.1.0-preview.2"
+    "com.autodesk.fbx": "4.0.0-pre.1"
   },
   "unity": "2018.4",
   "unityRelease": "0f1",