UI improvement Phase 1

- Simplified theme/style settings and corrected UI styles
- Move «Add To Library» button from toolbar to be simple  to find/press
it
- Toolbar in chapter list with sort/filtration
- library/catalog layout fixes

app/src/main/res/drawable/line_divider.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+
+    <size
+        android:width="1dp"
+        android:height="1dp" />
+
+    <solid android:color="@color/divider" />
+
+</shape>