Add custom theme derived from Material Light

This restores the attempt to use Material Light except that it overrides
the status bar to black as the previous theme did. A custom theme using
a resource value file is needed for that.

This depends on the new `--res-values` option in python-for-android
v2022.09.04-endless11.

Fixes: #174

.p4a

@@ -11,12 +11,14 @@
 --allow-minsdk-ndkapi-mismatch
 --permission ACCESS_NETWORK_STATE
 --permission FOREGROUND_SERVICE
+--android-apptheme "@style/KeyTheme"
 --service remoteshell:remoteshell.py
 --presplash assets/presplash.png
 --presplash-color #F15A22
 --icon assets/icon.png
 --icon-fg assets/icon-fg.png
 --icon-bg assets/icon-bg.png
+--res-values res/values/styles.xml
 --window
 --fileprovider-paths src/fileprovider_paths.xml
 --add-asset assets/_load.html:_load.html

requirements.txt

@@ -1,3 +1,3 @@
 cython~=0.29
 virtualenv
-git+https://github.com/endlessm/python-for-android@v2022.09.04-endless10#egg=python-for-android
+git+https://github.com/endlessm/python-for-android@v2022.09.04-endless11#egg=python-for-android

res/values/styles.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+  <style name="KeyTheme" parent="android:Theme.Material.Light.NoActionBar">
+    <item name="android:statusBarColor">@android:color/black</item>
+  </style>
+</resources>