Add services main folder + histogram server binary w/o FairMQ + tester binary example

Depends on !1199 (merged)

Basically a version of the FairMQ Histogram Server stripped down of any FairMQ feature and adapted to the binary style used in algo and reco.

Runs and pops the server (http server accessible in Firefox) but:

• Input interface defined only as example, basically port of interface in FairMQ server!
  • Example uses naked ZMQ and probably lacks some checks and abstractions, potentially leading to crashes
  • Something need to be invented with more careful thoughts to replace FairMQ
• Commands do not work as the static boolean accessed by CLING do not seem to be share to the main threads (worked in FairTask world)
• No signals catching
• Due to this, no mechanism to stop the main loop apart from Ctrl+C
  => the termination sequence is not tested
• Tested with histos and canvases (see example) using a port of the old interface from the FairMQ server

Redmine: Refs #2998