Update xposed module metadata parsing (#558)

* Stop read xposedmodule

Official documentation requires `xposedmodule` value is `true`, but in the previous implementation there was no judgment on what the value was, even if `false`. So, remove it and use `xposedminversion` to determine if the app is an xposed module.

* xposedscope supports string

```xml
<meta-data
android:name="xposedscope"
android:value="com.example.app1;com.example.app2" />
```

[app] Allow using system accent color as theme color (S+) (#560)

* Compile with Android S SDK

* [app] Allow using system accent color as theme color (S+)

[app] Fix app installation (#562)

[translation] Xposed Module (#563)

Update strings.xml (#565)

Update theme (#568)