Adding default parameters for ppl perception pipeline

So far no one is really using the config manager and the default parameters apart from the twitter account. Hence, I'm not really sure what the config manager was meant for but I want to use the datacentre for the myriade of config parameters the ppl perception currently has. All of these haven't been changed since it was rosyfied last year so they can be considered default I presume.

Tested on Linda and thanks to @cburbridge it works fine.
Maybe @cburbridge and @kunzel can give this PR a try to test if the datacentre does what it's supposed to and to see if the ppl perception works.