ICU 52 local changes part1

1. Remove all the obsolete patches. There are lots of them because most of
local patches to ICU 4.6.1 have either been accepted or become obsolete.
The largest local patch removed is our patches for CJ word breaker because
they were upstreamed.

Android didn't apply the CJK word breaker patch to ICU 4.6 to reduce the
data size. In a follow-up CL, we'll have an Android-specific change for this issue.

Besides, we don't include patches for files we locally add because the
patches for new files are redundant. Instead, they're mentioned in
README.chromium.

2. We don't need platform-specific headers any more (pmac, plinux, pwin, etc).
They're combined into a single file and all platforms we care about are
well-supported except for one issue on Android/QNX. putil.patch takes care
of it.


3. Breakiterator patches for a few remaining issues. We also use
a much smaller Khmer dictionary (upstream fix pending).

4. Converter
  - Introduced two WHATWG-encoding-standard-compliant mapping tables
    are added (derived directly from the spec with a script) for EUC-JP
    and CP866
  - Disabled various non-HTML5-encodings such as SCSU,BOCU, UTF-7, CESU-8
    saving ~30kB in the code size. Even though we link statically, they're
    still pulled in as a part of uconv.
  - Disabled ISO-2022-JP-[1-4] in ucnv2022.c
  - Removed a number of encoding alias entries in the alias table
    leading to ~40kB data size reduction.

5. Locale data : Haven't yet updated. We need to trim them substantially.

6. Unihan collation removal is now done with a script (scripts/remove_unihan.sh)

7. Updated timezone data to the latest (2014b) as of today.

8. Customized transliterator for Greek uppercasing

9. Updated data build related patches. The windows data build patch has yet
   to be updated.

10. The updated ICU data file/assembly source files are not included in this
    CL. They'll be updated in a separate CL.
    With all the size reduction changes applied, the data size went down
    from > 23MB to 12.4MB. However, it's still 2.5MB larger than ICU 4.6.1
    data. The locale data trimming will bring it down further.

11. Update README.chromium accordingly. The only exceptions are
item #5 and the android entry in item #3 (breakiterator. see #1 above)



BUG=259715,76328
TEST=Following the procedure outlined in README.chromium, one can build
the icu data file.

R=jsbell@chromium.org, mark@chromium.org

Review URL: https://codereview.chromium.org/224943002

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/icu52@262192 4ff67af0-8c30-449e-8e8b-ad334ec8d88c