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/).

app/build.gradle

@@ -5,8 +5,9 @@ android {
     buildToolsVersion "25.0.2"
 
     dependencies {
-        compile 'com.android.support:support-annotations:25.2.0'
-        compile "com.android.support:support-v4:25.2.0"
+        compile 'com.android.support:support-annotations:25.3.1'
+        compile "com.android.support:support-v4:25.3.1"
+        compile project(":view")
     }
 
     defaultConfig {
@@ -15,16 +16,6 @@ android {
         targetSdkVersion 25
         versionCode 48
         versionName "0.48"
-
-        externalNativeBuild {
-            ndkBuild {
-                cFlags "-std=c11", "-Wall", "-Wextra", "-Werror", "-Os", "-fno-stack-protector", "-Wl,--gc-sections"
-            }
-        }
-
-        ndk {
-            abiFilters 'x86', 'x86_64', 'armeabi-v7a', 'arm64-v8a'
-        }
     }
 
     buildTypes {
@@ -34,12 +25,6 @@ android {
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
-
-    externalNativeBuild {
-        ndkBuild {
-            path "src/main/jni/Android.mk"
-        }
-    }
 }
 
 dependencies {