Installer, PRC, Remote: migrate and merge Config handling
Installer, PRC, Remote: migrate and merge Config handling

PRC and Installer used to have a config module each. These modules
were very similar and did the same thing. I migrated them into one
in the Artemis::Remote project to make sure both benefit from
improvements and bug fixes.

tapper/Tapper-PRC,tapper/Tapper-PRC,tapper/Tapper-PRC