* Use mockwebserver instead of live network for tests
Fixes#2680. Fixes#1904.
* Remove use of deprecated methods
* Convert to use Apache HTTP Components client library
Fixes#1410 by virtue of redirect following being a built-in
capability of the library, along with retries with binary backoff,
built-in decompression, etc.
* Address review comments
* added options ui
* added definition for both separators
* added tests
* removed definitions from backend and added them to frontend
* added reverse order and handling for accented characters
* added tests for accented characters and reverse split
* fixed build errors
* unicode character ranges instead
* added examples
