Update Android port

Update Android port

* doc/emacs/android.texi (Android, Android Environment): Improve
documentation.
* doc/lispref/commands.texi (Touchscreen Events): Document
changes to touchscreen support.
* doc/lispref/display.texi (Defining Faces, Window Systems):
* doc/lispref/frames.texi (Frame Layout, Font and Color
Parameters):
* doc/lispref/os.texi (System Environment): Document Android in
various places.

* java/org/gnu/emacs/EmacsWindow.java (figureChange): Fix crash.
* lisp/loadup.el: ("touch-screen"): Load touch-screen.el.
* lisp/pixel-scroll.el: Autoload two functions.
* lisp/term/android-win.el: Add require 'touch-screen.
* lisp/touch-screen.el (touch-screen-current-tool)
(touch-screen-current-timer, touch-screen-delay)
(touch-screen-relative-xy, touch-screen-handle-scroll)
(touch-screen-handle-timeout, touch-screen-handle-point-update)
(touch-screen-handle-point-up, touch-screen-handle-touch)
(global-map, touch-screen): New file.
* src/android.c (android_run_debug_thread): Fix build on 64 bit
systems.
(JNICALL, android_put_pixel): Likewise.
(android_transform_coordinates, android_four_corners_bilinear)
(android_fetch_pixel_bilinear, android_project_image_bilinear)
(android_fetch_pixel_nearest_24, android_fetch_pixel_nearest_1)
(android_project_image_nearest): New functions.
* src/androidgui.h (struct android_transform): New structure.
* src/androidterm.c (android_note_mouse_movement): Remove
obsolete TODO.
(android_get_scale_factor): New function.
(android_draw_underwave): Scale underwave correctly.
* src/dispextern.h: Support native image transforms on Android.
* src/image.c (matrix_identity, matrix_rotate)
(matrix_mirror_horizontal, matrix_translate): New functions.
(image_set_transform): Implement native image transforms on
Android.
(Fimage_transforms_p): Implement on Android.

* src/keyboard.c (make_lispy_event, syms_of_keyboard): Handle
touch screen- menu bar events.
* src/sfnt.c: Fix typo in comment.
* src/sfntfont-android.c (sfntfont_android_blend, U255TO256)
(sfntfont_android_put_glyphs): Avoid redundant swizzling.
* src/sfntfont.c (sfntfont_lookup_char): Fix build on 64 bit
systems.