Move BigIcon into Compound and add a new TitleAndIcon component. (#4866)

* Move BigIcon into Compound.

* Replace the old server selection image asset with the \.host icon.

* Add a new TitleAndIcon component to Compound.

* Add the ability to override TitleAndIcon's padding.

ElementX/Resources/Assets.xcassets/images/authentication/Contents.json

@@ -1,6 +0,0 @@
-{
-  "info" : {
-    "author" : "xcode",
-    "version" : 1
-  }
-}

ElementX/Resources/Assets.xcassets/images/authentication/server-selection-icon.imageset/Contents.json

@@ -1,15 +0,0 @@
-{
-  "images" : [
-    {
-      "filename" : "authentication_server_selection_icon.svg",
-      "idiom" : "universal"
-    }
-  ],
-  "info" : {
-    "author" : "xcode",
-    "version" : 1
-  },
-  "properties" : {
-    "preserves-vector-representation" : true
-  }
-}

ElementX/Resources/Assets.xcassets/images/authentication/server-selection-icon.imageset/authentication_server_selection_icon.svg

@@ -1,3 +0,0 @@
-<svg width="32" height="32" viewBox="0 0 32 32" fill="none" xmlns="http://www.w3.org/2000/svg">
-<path d="M28.25 17.75H3.75C1.825 17.75 0.25 19.325 0.25 21.25V28.25C0.25 30.175 1.825 31.75 3.75 31.75H28.25C30.175 31.75 31.75 30.175 31.75 28.25V21.25C31.75 19.325 30.175 17.75 28.25 17.75ZM7.25 28.25C5.325 28.25 3.75 26.675 3.75 24.75C3.75 22.825 5.325 21.25 7.25 21.25C9.175 21.25 10.75 22.825 10.75 24.75C10.75 26.675 9.175 28.25 7.25 28.25ZM28.25 0.25H3.75C1.825 0.25 0.25 1.825 0.25 3.75V10.75C0.25 12.675 1.825 14.25 3.75 14.25H28.25C30.175 14.25 31.75 12.675 31.75 10.75V3.75C31.75 1.825 30.175 0.25 28.25 0.25ZM7.25 10.75C5.325 10.75 3.75 9.175 3.75 7.25C3.75 5.325 5.325 3.75 7.25 3.75C9.175 3.75 10.75 5.325 10.75 7.25C10.75 9.175 9.175 10.75 7.25 10.75Z" fill="#737D8C"/>
-</svg>