bring metrics to order, fix typos, add <recType, Metric> signature

[maxfilippov]

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[maxfilippov]

• fix typos in metric names and params
• update Entropy & VOI with <Metric, RecType> signature,
• add global utils.hpp with type converters, update algorithms that depeng on it (ESN, PCFA, DSPCC) to make them use the common code
• update Entropy & VOI to make it support Blaze vector input
• update inner and output value type of all metrics to double

[maxfilippov]

continuing after rename merged..

[maxfilippov]

there are multiple issues and branches related to the general refactoring:

The main discussion about API changes is in #180 (branch https://github.com/panda-official/metric/tree/framework_design, started only for discussion, not to be merged)

Also there are branches
https://github.com/panda-official/metric/commits/refactored (newer)
and
https://github.com/panda-official/metric/commits/refactored_jura (older, with some already changes moved to the refactored branch)
, where some breaking changes are implemented. Continuing with these branches will change the API and needs changes to client caller code. Also, since the work was paused, both of them may be outdated.

Also there are old issues related to the general refactoring task:
#21 (unify the API of distance functions and factory functions in distance module. #21) - distance functions/functors is what the refactoring begins from
#32 (make all functions work with blaze container inputs. #32) - also can be considered as a subtask of the refactoring
#29 (update Wavelet API #29) - particular task for wavelet module also covered by general refactoring

I think we can unite these issues into one