Add (black)Material icons for light theme

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

@@ -2,7 +2,7 @@
     xmlns:app="http://schemas.android.com/apk/res-auto">
     <item android:id="@+id/menu_upload_single"
         android:title="@string/menu_upload_single"
-        android:icon="@drawable/ic_send_white_24dp"
+        android:icon="?attr/iconSend"
         android:enabled="false"
         app:showAsAction="always" />
 </menu>

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

@@ -4,6 +4,6 @@
     xmlns:app="http://schemas.android.com/apk/res-auto">
     <item android:id="@+id/menu_save_categories"
           android:title="@string/menu_save_categories"
-          android:icon="@drawable/ic_save_white_24dp"
+          android:icon="?attr/iconSave"
           app:showAsAction="always" />
 </menu>

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

@@ -4,13 +4,13 @@
           android:title="@string/menu_from_camera"
           android:orderInCategory="100"
           app:showAsAction="ifRoom|withText"
-          android:icon="@drawable/ic_photo_camera_white_24dp"
+          android:icon="?attr/iconCamera"
             />
     <item android:id="@+id/menu_from_gallery"
         android:title="@string/menu_from_gallery"
         android:orderInCategory="200"
         app:showAsAction="ifRoom|withText"
-        android:icon="@drawable/ic_photo_white_24dp"
+        android:icon="?attr/iconPhoto"
             />
     <item android:id="@+id/menu_settings"
           android:title="@string/menu_settings"

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

@@ -18,7 +18,7 @@
     <item
         android:id="@+id/menu_retry_current_image"
         android:enabled="false"
-        android:icon="@drawable/ic_undo_white_24dp"
+        android:icon="?attr/iconUndo"
         android:title="@string/menu_retry_upload"
         android:visible="false"
         app:showAsAction="ifRoom|withText" />

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

@@ -6,6 +6,6 @@
     <item android:id="@+id/menu_upload_multiple"
           android:title="@string/share_upload_button"
           app:showAsAction="always|withText"
-          android:icon="@drawable/ic_send_white_24dp"
+        android:icon="?attr/iconSend"
         />
 </menu>

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

@@ -8,4 +8,9 @@
     <attr name="buttonBackground" format="reference"/>
     <attr name="uploadOverlayBackground" format="reference"/>
     <attr name="toggleButtonIcon" format="reference"/>
+    <attr name="iconSend" format="reference"/>
+    <attr name="iconSave" format="reference"/>
+    <attr name="iconCamera" format="reference"/>
+    <attr name="iconPhoto" format="reference"/>
+    <attr name="iconUndo" format="reference"/>
 </resources>

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

@@ -9,7 +9,11 @@
         <item name="buttonBackground">@color/button_background_dark</item>
         <item name="uploadOverlayBackground">@color/upload_overlay_background_dark</item>
         <item name="toggleButtonIcon">@drawable/toggle_inverse</item>
-
+        <item name="iconSend">@drawable/ic_send_white_24dp</item>
+        <item name="iconSave">@drawable/ic_save_white_24dp</item>
+        <item name="iconCamera">@drawable/ic_photo_camera_white_24dp</item>
+        <item name="iconPhoto">@drawable/ic_photo_white_24dp</item>
+        <item name="iconUndo">@drawable/ic_undo_white_24dp</item>
     </style>
 
     <style name="LightAppTheme" parent="Theme.AppCompat.Light">
@@ -21,6 +25,11 @@
         <item name="buttonBackground">@color/button_background_light</item>
         <item name="uploadOverlayBackground">@color/upload_overlay_background_light</item>
         <item name="toggleButtonIcon">@drawable/toggle</item>
+        <item name="iconSend">@drawable/ic_send_black_24dp</item>
+        <item name="iconSave">@drawable/ic_save_black_24dp</item>
+        <item name="iconCamera">@drawable/ic_photo_camera_black_24dp</item>
+        <item name="iconPhoto">@drawable/ic_photo_black_24dp</item>
+        <item name="iconUndo">@drawable/ic_undo_black_24dp</item>
     </style>
 
     <style name="NoTitle" parent="DarkAppTheme">