Move plugins to "sonar/desktop/plugins"

Summary:
Plugins moved from "sonar/desktop/src/plugins" to "sonar/desktop/plugins".

Fixed all the paths after moving.

New "desktop" folder structure:
- `src` - Flipper desktop app JS code executing in Electron Renderer (Chrome) process.
- `static` - Flipper desktop app JS code executing in Electron Main (Node.js) process.
- `plugins` - Flipper desktop JS plugins.
- `pkg` - Flipper packaging lib and CLI tool.
- `doctor` - Flipper diagnostics lib and CLI tool.
- `scripts` - Build scripts for Flipper desktop app.
- `headless` - Headless version of Flipper desktop app.
- `headless-tests` - Integration tests running agains Flipper headless version.

Reviewed By: mweststrate

Differential Revision: D20344186

fbshipit-source-id: d020da970b2ea1e001f9061a8782bfeb54e31ba0

desktop/plugins/databases/ButtonNavigation.js

@@ -0,0 +1,48 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+import {Button, ButtonGroup, Glyph, colors} from 'flipper';
+
+export default function ButtonNavigation(props: {|
+  /** Back button is enabled */
+  canGoBack: boolean,
+  /** Forwards button is enabled */
+  canGoForward: boolean,
+  /** Callback when back button is clicked */
+  onBack: () => void,
+  /** Callback when forwards button is clicked */
+  onForward: () => void,
+|}) {
+  return (
+    <ButtonGroup>
+      <Button disabled={!props.canGoBack} onClick={props.onBack}>
+        <Glyph
+          name="chevron-left"
+          size={16}
+          color={
+            props.canGoBack
+              ? colors.macOSTitleBarIconActive
+              : colors.macOSTitleBarIconBlur
+          }
+        />
+      </Button>
+      <Button disabled={!props.canGoForward} onClick={props.onForward}>
+        <Glyph
+          name="chevron-right"
+          size={16}
+          color={
+            props.canGoForward
+              ? colors.macOSTitleBarIconActive
+              : colors.macOSTitleBarIconBlur
+          }
+        />
+      </Button>
+    </ButtonGroup>
+  );
+}