Split NIUP and NIUPC modules

NIUP and NIUPC modules are physically split

NIUP no longer exports NIUPC

API documentation is split into multiple documents

All IUP controls with strong typed API, with most of attribute and ca…

…llback functions.

Replace deprecated cuchar with uint8

fix pkg

IUP 3.30

3.29.1, doc update

Bindings for IUP 3.29 and Nim 1.2.0

Fixed for Nim 1.2, docs updated

Bindings and fix for IUP 3.28 and Nim 1.0.4