Prefixed all tokens with T_ to prevent collisions with macros.

Identifier names like "IN" and "AS" have a high probability of being
defined by certain platforms as macros, esp. with Visual Studio.

Change-Id: I1fbc0ae33f94387b83377181b6012683a418459a
Reviewed-by: Simon Hausmann <simon.hausmann@theqtcompany.com>