Add xedbug & debug

[kuuak]

In the latest projects (FWT, Vidy, ...) I included xdebug in the stack which help me quite a lot to debug and dev on the php side more effectively.

Do you see any problem to include it back in the boilerplate?

If not I'll create a PR

[kuuak]

• https://github.com/superhuit-agency/eca-vaud.ch/pull/40/commits/373b5e95e887c360fe0af9095e289b318a5ecc10
• https://github.com/superhuit-agency/eca-vaud.ch/pull/40/commits/df8eb04b073dee4d287e750f04d4d25b180abda2
• https://github.com/superhuit-agency/eca-vaud.ch/pull/40/commits/7de17a8ff706d7b0a71f11a6df9de0f12cb60552