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/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

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+<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>