ICU-21061 integrate CLDR release-37-beta3 to master

(cherry-picked from 71fa037)

ICU-20979 API Change Report for 67 RC

ICU-20965 Remove VS2015 from CI builds, no longer supported by Azure …

…Pipelines

(cherry-picked from f411b41)

ICU-20975 BRS66rc Fix warnings found when building ICU4C samples.

ICU-20857 update API Change Report for ICU 66preview

- uses tools updated in [ICU-20910]

ICU-20796 update C API Change Report

ICU-20795 ICU4C 65.1 API promotion - locid.h

- fixup some functions in locid.h that were incorrectly guarded as draft
- Error was in:
   - 5a3ea66
   - unicode-org#808

ICU-20563 fix macosx rpath breakage in the data build

- in the rpath case, we do NOT want a trailing space in LD_SONAME

regression was introduced in ICU-20526 with
 83a0542 (master)
 b76cb65 (in maint-64)

(cherry picked from commit 1c553b9)

ICU-20515 Merging tz2019a changes.

ICU-20536 ICU 63.2 release tasks + tzdata2019a