@API updates:
- Migrating from associative containers to more performant types. Eg: map to absl::btree_map.
- Synchronise the write access to map "AreaCodeMaps" using absl::Mutex locking api.
- Use more of absl:strings packages like absl::StrReplaceAll
@Build updates:
- To build (CMake) against absl packages, the minimum version of compiler is CPP11+, whereas earlier we are not mandating this.
- We are upgrading CMAKE version also to automate building the external absl packages.
The change is announced. Please report issues in case of any breakages.
https://issuetracker.google.com/issues?q=componentid:192347%20555
Update doc references to refer to CLDR and the page of CLDR codes where
appropriate - it used to say ISO country codes were used, but they aren't.
Also updated to refer to two *or three* letter language codes since they may be three letters (we use the shortest defined one for a language)
Updating comments about leadingDigits field at territory level as well.