evas_object_textblock: add support for variation sequences
Summary: update font processing to handle variation sequences unicodes to select proper glypg in respect to variation seqences
Test Plan:
```
#define EFL_EO_API_SUPPORT 1
#define EFL_BETA_API_SUPPORT 1
#include <Eina.h>
#include <Efl.h>
#include <Elementary.h>
EAPI_MAIN int
elm_main(int argc, char **argv)
{
Evas_Object *win, *textblock;
elm_policy_set(ELM_POLICY_QUIT, ELM_POLICY_QUIT_LAST_WINDOW_CLOSED);
win = elm_win_util_standard_add("Main", "");
elm_win_autodel_set(win, EINA_TRUE);
textblock = evas_object_textblock_add(win);
efl_canvas_text_style_set(textblock,NULL,"DEFAULT='font=DejaVuSans font_fallbacks=SamsungColorEmoji color=#000 font_size=20'");
evas_object_textblock_text_markup_set(textblock, "8️⃣☪️AAA☪︎1234567️⃣");
evas_object_size_hint_weight_set(textblock, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
evas_object_size_hint_align_set(textblock, EVAS_HINT_FILL, EVAS_HINT_FILL);
evas_object_show(textblock);
evas_object_move(textblock, 0, 0);
evas_object_resize(textblock, 320, 320);
evas_object_resize(win, 320, 320);
evas_object_show(win);
elm_run();
return 0;
}
ELM_MAIN()
```
Reviewers: woohyun, bowonryu, segfaultxavi, cedric, bu5hm4n
Reviewed By: woohyun, cedric
Subscribers: bu5hm4n, subodh6129, herdsman, segfaultxavi, zmike, cedric, #committers, #reviewers
Tags: #efl
Differential Revision: https://phab.enlightenment.org/D9053
