gltrace: Patch up all glUniform*() calls.

This patch updates the trace information for all glUniform*() calls
to have the right data (the actual uniforms that are passed).

In addition, as soon as a program is linked, information regarding
all the active attributes and uniforms is passed on to the debugger.

Change-Id: Icfbc6722789b42c413a845cf546577fa6de7da2b