reorganised efeature documentation

[AurelienJaquier]

Description

renamed Voltage features -> Subthreshold features

moved from Python features:
to Spike event features: spikes_per_burst, spikes_per_burst_diff, spikes_in_burst1_burst2_diff, spikes_in_burst1_burstlast_diff

to Spike shape features: initburst_sahp, initburst_sahp_ssse, initburst_sahp_vb, phaseslope_max

I did not move depol_block_bool or impedance, because they don't fit in spike-related features, neither in subthreshold features

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.73%. Comparing base (2cddd26) to head (8814c41).
Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #382   +/-   ##
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  Coverage   91.73%   91.73%           
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  Files          36       36           
  Lines        6278     6278           
  Branches     2033     2033           
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  Hits         5759     5759           
  Misses        266      266           
  Partials      253      253           

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[anilbey]

Thank you