Update Android port

Update Android port

* doc/emacs/input.texi (On-Screen Keyboards):
* doc/lispref/commands.texi (Misc Events): Improve documentation
of text conversion stuff.
* java/org/gnu/emacs/EmacsInputConnection.java (beginBatchEdit)
(endBatchEdit, commitCompletion, commitText, deleteSurroundingText)
(finishComposingText, getSelectedText, getTextAfterCursor)
(EmacsInputConnection, setComposingRegion, performEditorAction)
(getExtractedText): Condition debug code on DEBUG_IC.
* java/org/gnu/emacs/EmacsService.java (EmacsService, updateIC):
Likewise.
* lisp/bindings.el (global-map):
* lisp/electric.el (global-map): Make `text-conversion'
`analyze-text-conversion'.
* lisp/progmodes/prog-mode.el (prog-mode): Enable text
conversion in input methods.
* lisp/simple.el (analyze-text-conversion): New function.
* lisp/textmodes/text-mode.el (text-conversion-style)
(text-mode): Likewise.
* src/androidterm.c (android_handle_ime_event): Handle
set_point_and_mark.
(android_sync_edit): Give Emacs 100 ms instead.
(android_perform_conversion_query): Skip the active region, not
the conversion region.
(getSelectedText): Implement properly.
(android_update_selection): Expose mark to input methods.
(android_reset_conversion): Handle `text-conversion-style'.
* src/buffer.c (init_buffer_once, syms_of_buffer): Add buffer
local variable `text-conversion-style'.
* src/buffer.h (struct buffer, bset_text_conversion_style): New
fields.
* src/emacs.c (android_emacs_init): Call syms_of_textconv.
* src/frame.h (enum text_conversion_operation): Rename
TEXTCONV_SET_POINT.
* src/lisp.h: Export syms_of_textconv.

* src/marker.c (set_marker_internal): Force redisplay when the
mark is set and the buffer is visible on builds that use text
conversion.  Explain why.

* src/textconv.c (copy_buffer): Fix copying past gap.
(get_mark): New function.
(textconv_query): Implement new flag.
(sync_overlay): New function.  Display conversion text in an
overlay.
(record_buffer_change, really_commit_text)
(really_set_composing_text, really_set_composing_region)
(really_delete_surrounding_text, really_set_point)
(handle_pending_conversion_events_1, decrement_inside)
(handle_pending_conversion_events, textconv_set_point)
(get_extracted_text, register_textconv_interface): Various fixes
and improvements.

* src/textconv.h (struct textconv_interface): Update
documentation.
* src/window.h (GCALIGNED_STRUCT): New field `prev_mark'.
* src/xdisp.c (mark_window_display_accurate_1): Handle
prev_mark.