EZP-22152: list used templates in the web debug toolbar

http://jira.ez.no/browse/EZP-22152.
Re-launch of https://github.com/ezsystems/ezpublish-kernel/pull/382 by @dspe.

**Debug Toolbar**
![capture decran 2013-05-30 a 15 27 16](https://f.cloud.github.com/assets/329691/585009/ed186b8c-c92c-11e2-882f-6a65c8349244.png)

**Profiler page**
![capture decran 2013-05-30 a 15 27 25](https://f.cloud.github.com/assets/329691/585011/f15c39a8-c92c-11e2-99ed-a894388fe6c9.png)

**Legacy Templates**
![capture decran 2013-05-31 a 10 55 18](https://f.cloud.github.com/assets/329691/589888/d959da60-c9cf-11e2-95f6-e527dde6db97.png)