* [core] Line-break ideographic text by character
Allow a line break to be inserted after any supported Chinese, Japanese, or Yi character in a point-placed label. Balance the lines unless non-ideographic text such as Latin letters are present.
Fixes#1223.
* [core] Moved more character classing into util::i18n
* [core] Detect character properties by Unicode block
* [test] Reenabled ideographic breaking tests