Android: starting to use CMake to build AndroidStudio files.

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diff --git a/README.Android.txt b/README.Android.txt
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-
-README.Android.txt - Building and using FLTK with Android Studio 3
-==================================================================
-
-
-WARNING: FLTK FOR ANDROID IS WORK IN PROGRESS IN A PRETTY EARLY STAGE.
-
-
-CONTENTS
---------
-
-  1 Building FLTK with Android Studio 3
-  2 Building Apps on an Android device with C4Droid
-  3 Extensions and limitation of FLTK on Android
-  4 DOCUMENT HISTORY
-
-
-BUILDING FLTK SAMPLE WITH ANDROID STUDIO 3
-------------------------------------------
-
-There is no need to ever write a single line of Java.
-
-Download and install AndroidStudio on your developer machine. If you use
-AndroidStudio for the first time, use the IDE to download and build the
-"Native Plasm" sample app. In the process, all resources required to build
-FLTK will be installed. Once Native Plasm runs on your emulator or physical
-device, you are ready to install FLTK.
-
-- if your host machine runs MSWindows, rename the file
-  "ide/AndroidStudio3/gradlew.rename_to_bat" to "gradlew.bat" first
-
-- open the "ide/AndroidStudio3/" directory as a project in AndroidStudio
-
-- click "run"; the project should compile and run out of the box
-
-
-Building Apps on an Android device with C4Droid
------------------------------------------------
-
-WORK IN PROGRESS:
-C4Droid is a minimal IDE that comes with gcc/g++ and runs directly on your
-Android device. C4Droid supports Native Activities, SDL, SDL2, and even Qt.
-FLTK uses the Native Activity mechanism, so why not write FLTK apps right
-on your phone?
-
- - compile and test the Android test app in ide/HelloAndroid
- - create /sdcard/include/ and /sdcard/lib/ on your Android device
- - copy (fltk)/FL/ and its content into /sdcard/include/
- - copy (fltk)/ide/AndroidStudio3/FL/abi-version.h to /sdcard/include/FL/
- - copy (fltk)/ide/AndroidStudio3/./app/.externalNativeBuild/cmake/debug/arm64-v8a/fltk/lib/libfltk.a
-   to /sdcard/lib/
- - ... change Native Activity settings in c4Droid preferences
- - ... remove native glue
- - ... add include and library path, add library
- - ... add support for (which?) STL library
-
-
-Extensions and limitation of FLTK on Android
---------------------------------------------
-
-Android support for FLTK is in an early stage. As of March 2018, most
-rendering works, fonts work, bitmaps and pixmaps work, clipping works, window
-layering works, and mouse clicks and keyboard events are handled
-
-When loading fonts:
- - font names starting with a $ will have the system font path inserted
- - font names starting with an @ will be loaded via the Asset Manager
- - all other names will be used verbatim
-
-Limitations:
- - the screen size is currently fixed to 600x800 and is scaled up
- - many many big and little functions are not yet implemented
-
-
-Scratch Pad
------------
-
-2019 approach: 
-```bash
-cmake -G "Unix Makefiles" \
-      -D OPTION_USE_SYSTEM_LIBJPEG=Off \
-      -D OPTION_USE_SYSTEM_ZLIB=Off \
-      -D OPTION_USE_SYSTEM_LIBPNG=Off \
-      -D OPTION_CREATE_ANDROID_STUDIO_IDE=On \
-      ../..
-```
-
-
-DOCUMENT HISTORY
-----------------
-
-Mar 29 2018 - matt: many graphics functions ahve been implemented, keyboard
-Mar 17 2018 - matt: added Android extensions for fonts
-Mar 12 2018 - matt: started list of limitation that serevs as information to the
-                    user as much as a todo list for core developers
-Mar  6 2018 - matt: moved project to ide/AndroidStudio3/
-Mar  2 2018 - matt: rewriting Android port and documentation from scratch
-Feb  9 2016 - matt: recreated document with more warnings and active support