Update ICU to 58.1

Update ICU to 58.1

Update pre-built ICU data files

Update *local.mk with a new copyright line

Apply more patches

The following patches were applied and updated.
  data_symb, vscomp, wpo

The unnecessary part was dropped from vscomp

Update BUILD.gn and icu.gyp* files


Update android/brkitr.patch


Update and apply more patches

Update and apply cjdict.patch
Apply data.build.patch

Delete obsolete patches: cmemory,regex

Update README.chromium and apply brkitr patches

* Update README.chromium
* Remove obsolete patches
* Update linebrk.patch and apply it: add back line_loose_cj
* Update wordbrk.patch and apply it
* Update and apply khmer-dictbe.patch

Update LICENSE, README.chromium and update.sh


Update data trimming

*  android/patch_locale.sh
*  scripts/trim_data.sh
   ExemplarCh* removed
   charac*Label removed
   relative/relativeTime removed for daysOfWeek and quarter

Update the following patches

 android/brkitr.patch
 patches/linebrk.patch
 patches/data.build.patch

Update to ICU 58rc

1. Update to ICU 58rc
2. Move source/data/brkitr/{word_ja,khmerdict}.txt to
   {rules,dictionaries}
3. Update data_files_to_preserve.txt accordingly
4. Update patches/{linebrk,cjdict}.patch (not applied)

BUG=637001
TEST=Various unit_tests, blink tests, v8 tests