Expanded RingCounting functionality

[s4294967296]

• Add RC data flow from boost stores, not requiring a pre-computed CNNImage file anymore
• Add "load_from_file" config parameter. Config setting: 0/1
• Add Execute() method in Tool class
• Add get_next_event() method in Tool class
• Change functionality of other methods to support both "load_from_file" settings
• The Tool expects a CNNImage formatted input (std::vector) called "CNNImageCharge" within the "RecoEvent" boost store when not using the input from file
• The predictions are stored in the "RecoEvent" boost store as "RingCountingSRPrediction" and "RingCountingMRPrediction"

Ringcounting/README.md:

• Specify where the predictions are stored (RecoEvent)
• Complete list of config parameters

[marc1uk]

Hi Daniel,
Looks good from what I can follow. Would you be able to go over the updated modes in next week's software meeting on integrating this into a standard ToolChain?