Split up into modules and add float module

Split the app/ module into three modules

terminal/ - Terminal emulator library module.
view/ - Terminal view library module (depending on terminal/).
app/ - The main Termux app (depending on view/).

Also add the

float/ - The Termux:Float app (depending on view/).

float/src/main/res/drawable/floating_window_background.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Background for the window, used to draw a border -->
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle" >
+    <stroke
+        android:width="1px"
+        android:color="@android:color/white" />
+    <solid android:color="#FF000000" />
+</shape>

float/src/main/res/drawable/floating_window_background_resize.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle" >
+    <stroke
+        android:width="1px"
+        android:color="@android:color/holo_red_light" />
+    <solid android:color="#FF000000" />
+</shape>

float/src/main/res/layout/activity_main.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<com.termux.window.TermuxFloatView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/window_layout"
+    android:layout_width="fill_parent"
+    android:layout_height="fill_parent"
+    android:background="@drawable/floating_window_background"
+    android:padding="1px" >
+
+    <com.termux.view.TerminalView
+        android:id="@+id/terminal_view"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_weight="1"
+        android:focusable="true"
+        android:focusableInTouchMode="true"
+        android:scrollbars="vertical" />
+
+</com.termux.window.TermuxFloatView>

float/src/main/res/layout/activity_permission.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+              android:orientation="vertical"
+              android:layout_width="match_parent"
+              android:gravity="center"
+              android:layout_height="match_parent">
+
+    <TextView
+        android:layout_gravity="center"
+        android:text="@string/draw_overlay_permission_explanation"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"/>
+
+    <LinearLayout
+        android:layout_gravity="center_horizontal"
+        android:gravity="center_horizontal"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content">
+    <Button
+        android:layout_marginTop="24dp"
+        android:text="@string/grant_permission"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:onClick="onOkButton"/>
+    </LinearLayout>
+
+</LinearLayout>

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

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+
+    <string name="app_name">Termux:Float</string>
+	<string name="initial_instruction_toast">Long press on window to move or resize\n\nDouble tap and drag finger up or down to change font size</string>
+	<string name="after_long_press">Drag to position and pinch to resize</string>
+
+    <string name="draw_overlay_permission_explanation">This app requires permission to draw overlays.</string>
+    <string name="grant_permission">Grant permission</string>
+
+	<string name="notification_title">Termux:Float</string>
+	<string name="notification_message_visible">Touch to hide window.</string>
+    <string name="notification_message_hidden">Touch to show window.</string>
+
+    <string name="paste_text">Paste</string>
+    <string name="copy_text">Copy</string>
+    <string name="text_selection_more">More…</string>
+
+</resources>

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

@@ -0,0 +1,20 @@
+<resources>
+
+    <!--
+        Base application theme, dependent on API level. This theme is replaced
+        by AppBaseTheme from res/values-vXX/styles.xml on newer devices.
+    -->
+    <style name="AppBaseTheme" parent="android:Theme.Light">
+        <!--
+            Theme customizations available in newer API levels can go in
+            res/values-vXX/styles.xml, while customizations related to
+            backward-compatibility can go here.
+        -->
+    </style>
+
+    <!-- Application theme. -->
+    <style name="AppTheme" parent="AppBaseTheme">
+        <!-- All customizations that are NOT specific to a particular API-level can go here. -->
+    </style>
+
+</resources>