Fix Clang 8 and GCC 9 warnings

Fix Clang 8 and GCC 9 warnings

Rename some TYPE_LAST and STATE_LAST enums that produce variable
shadowing warnings with Clang 8. Reimplement tcu::Format::Hex methods
using stringstream and IO manipulators instead of format strings
and add a cast to deUint32 to fix warnings on GCC 9.

Component: Framework

VK-GL-CTS issue: 1631

Change-Id: Ide4b25c106810b725c5ed7caaaf676f02e81b368