Begin implementation of components panel.

packages/builder/src/userInterface/ComponentsPaneSwitcher.svelte

@@ -50,24 +50,28 @@ const selectTab = tab =>
     height: 100%;
     display: flex;
     flex-direction: column;
+    padding: 2rem 1.5rem 2rem 1.5rem;
 }
 
 .switcher {
-    flex: 0 0 auto;
+    display: flex;
+    justify-content: space-between;
 }
 
 .switcher > button {
     display: inline-block;
-    background-color: rgba(0,0,0,0);
+    border: none;
-    border-style: solid;
-    border-color: var(--slate);
     margin: 5px;
     padding: 5px;
     cursor: pointer;
+    font-weight: 600;
+    font-size: 0.85rem;
+    text-transform: uppercase;
+    color: #999;
 }
 
 .switcher > .selected {
-    background-color: red;
+    color: #333;
 }
 
 .panel {

packages/builder/src/userInterface/EditComponentProps.svelte

@@ -186,9 +186,7 @@ const showDialog = () => {
     height: 100%;
     display: flex;
     flex-direction: column;
-    border-style: solid;
+
-    border-width: 1px 0 0 0;
-    border-color: var(--slate);
 }
 
 .title {