store other immutable tables in unicode_tables

- This is mainly for consistency with other tables.
deduplicate CodepointTries and leave the data in libphobos2.a

- Store the static immutable CodepointTries in separate functions.
use functions where applicable to reduce compile time/template bloat

- The semantic analysis and object generation only
  needs to be done once when building phobos.
  Using those overloads becomes a simple link dependency.

- add overloads for most common cases