Revert "Add const versions of base_uint.end()/begin(), make size() const."
Revert "Add const versions of base_uint.end()/begin(), make size() const."

This reverts commit a5b3724b7f2d47cf7d0bdfdc2b34be2d651b3736.

NeblioTeam/neblio,NeblioTeam/neblio,NeblioTeam/neblio,NeblioTeam/neblio,NeblioTeam/neblio