Add defineConstraints to defer compilation until dependencies are installed

The Runtime assembly (Ubiq.Genie) uses versionDefines/defineConstraints
to skip compilation until both com.ucl.ubiq and com.unity.webrtc-ubiq-fork
are present. The PostInstall editor assembly does the same for com.ucl.ubiq.

This prevents compilation errors on first UPM import, before the
AddDependencies script has had a chance to install Ubiq.

Author: nsalminen

Unity/Assets/Ubiq-Genie/Editor/PostInstall/Ubiq.Genie.Editor.PostInstall.asmdef

@@ -12,7 +12,15 @@
     "overrideReferences": false,
     "precompiledReferences": [],
     "autoReferenced": true,
-    "defineConstraints": [],
-    "versionDefines": [],
+    "defineConstraints": [
+        "UBIQ_GENIE_HAS_UBIQ"
+    ],
+    "versionDefines": [
+        {
+            "name": "com.ucl.ubiq",
+            "expression": "",
+            "define": "UBIQ_GENIE_HAS_UBIQ"
+        }
+    ],
     "noEngineReferences": false
 }

Unity/Assets/Ubiq-Genie/Runtime/Ubiq.Genie.asmdef

@@ -11,7 +11,21 @@
     "overrideReferences": false,
     "precompiledReferences": [],
     "autoReferenced": true,
-    "defineConstraints": [],
-    "versionDefines": [],
+    "defineConstraints": [
+        "UBIQ_GENIE_HAS_UBIQ",
+        "UBIQ_GENIE_HAS_WEBRTC"
+    ],
+    "versionDefines": [
+        {
+            "name": "com.ucl.ubiq",
+            "expression": "",
+            "define": "UBIQ_GENIE_HAS_UBIQ"
+        },
+        {
+            "name": "com.unity.webrtc-ubiq-fork",
+            "expression": "",
+            "define": "UBIQ_GENIE_HAS_WEBRTC"
+        }
+    ],
     "noEngineReferences": false
 }