Updating icu4c in OpenJFX:

1) Update the modules/javafx.web/src/main/legal/icu_web.md LICENSE file.
Update the version at the top. Copy the license from icu4c/LICENSE.
Update modules/javafx.web/src/main/native/Source/ThirdParty/icu/LICENSE as well.

2) Copy the files from common, i18n, stubdata and tools/toolutil directories.
Remove Makefile.in files.

3) Update modules/javafx.web/src/main/native/Source/ThirdParty/icu/CMakeLists.txt.
Update ICU_*_SOURCES using sources.txt file.
Set ICU_DATA_FILE_NAME variable to the correct icudt*l.dat file.

4) Update the ICU version in build.gradle.

5) Expand tabs and remove trailing white spaces from source files.

6) Make sure that the Line Endings are UNIX style for all the files.

7) Verification: FX sdk build and all test run, on all supported platforms.
