Fix menu bar icon. Add app icon.

ZeroTier One/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -41,8 +41,9 @@
       "scale" : "2x"
     },
     {
-      "idiom" : "mac",
       "size" : "512x512",
+      "idiom" : "mac",
+      "filename" : "ZeroTierIcon512x512.png",
       "scale" : "1x"
     },
     {

ZeroTier One/Assets.xcassets/MenuBarIconMac.imageset/Contents.json

@@ -2,12 +2,12 @@
   "images" : [
     {
       "idiom" : "mac",
-      "filename" : "MenuBarIconMac.png",
+      "filename" : "MenuBar.png",
       "scale" : "1x"
     },
     {
       "idiom" : "mac",
-      "filename" : "MenuBarIconMac@2x.png",
+      "filename" : "MenuBar@2x.png",
       "scale" : "2x"
     }
   ],

ZeroTier One/Info.plist

@@ -7,7 +7,7 @@
 	<key>CFBundleExecutable</key>
 	<string>$(EXECUTABLE_NAME)</string>
 	<key>CFBundleIconFile</key>
-	<string></string>
+	<string>ZeroTierIcon.icns</string>
 	<key>CFBundleIdentifier</key>
 	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
 	<key>CFBundleInfoDictionaryVersion</key>