Revert "Add `t'` (t scoped), and deprecate `with-scope`"

This reverts commit 933891777406b1d1f3db4862aa9070f2c08af411.
Housekeeping
Add `t-scoped`
Rename `with-scope` -> `with-tscope`, add JVM default locale *locale* fallback for `t'`
Rename (deprecated) `t'` -> `t-`
Bump version (2.0.0-alpha15)