feat: Toggle code editor (#60)

* feat: Toggle code editor

Enable editing post content mark up with the plain text editor.

* task: Capture build output

* fix: Clean up switch editor mode global

Avoid unexpected lingering globals.

* task: Capture build output

* feat: Reduce code editor text size and line height

Prioritize displaying more of the verbose content on the screen.

* task: Capture build output

android/Gutenberg/src/main/java/org/wordpress/gutenberg/GutenbergView.kt

@@ -57,6 +57,15 @@ class GutenbergView : WebView {
     private var openMediaLibraryListener: OpenMediaLibraryListener? = null
     private var editorDidBecomeAvailableListener: EditorAvailableListener? = null
 
+    var textEditorEnabled: Boolean = false
+        set(value) {
+            field = value
+            val mode = if (value) "text" else "visual"
+            handler.post {
+                this.evaluateJavascript("editor.switchEditorMode('$mode');", null)
+            }
+        }
+
     fun setContentChangeListener(listener: ContentChangeListener) {
         contentChangeListener = listener
     }