remove unnessary files of editor; add 'delete line' and 'copy line' options to editor context menu

app/src/main/res/menu/context_menu_editor.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <item
+        android:id="@+id/action_copy_line"
+        android:title="@string/text_copy_line"/>
+
+    <item
+        android:id="@+id/action_delete_line"
+        android:title="@string/text_delete_line"/>
+</menu>

app/src/main/res/values/strings.xml

@@ -310,4 +310,7 @@
     </string-array>
     <string name="title_activity_log">LogActivity</string>
     <string name="text_open_main_activity">打开主界面</string>
+    <string name="text_select_all">全选</string>
+    <string name="text_cut">剪切</string>
+    <string name="text_copy">复制</string>
 </resources>

app/src/main/res/values/styles.xml

@@ -7,6 +7,11 @@
 
     </style>
 
+    <style name="EditorTheme" parent="AppTheme">
+        <item name="android:windowActionModeOverlay">true</item>
+        <item name="android:actionModeBackground">@color/colorAccent</item>
+    </style>
+
     <style name="AppTheme.FullScreen" parent="AppTheme">
         <!-- Customize your theme here. -->
         <item name="windowNoTitle">true</item>