chance CLI codepage, only when SAPI is initialized

chance CLI codepage, only when SAPI is initialized

This finally solves issues with DBSC console codepages, and in
general improves the console codepage switching. When
module_initialized, all the possible encoding INI settings with
regard to possible modifications are set, and that's the
right moment to switch the console codepage in regard to I/O.
CJK glyphs might take more than 1 cell, so then  visual issues
can occur, when switching console codepage back and forth. Users
are free to use ini_set(), but any visual issues are then up to
the user responsibility.