Add particle analysis for series / time series

[TomSlater]

This PR adds the ability to track particles through a time series. The two main additions are as follows:

• Add function to analyse series of images, either a 3D Hyperspy 2D signal object or a list of these.

• Add function to track particles through a particle list from a series using the trackpy package.

[codecov[bot]]

Codecov Report

Merging #38 into master will decrease coverage by 0.42%. The diff coverage is 91.80%.

@@            Coverage Diff             @@
##           master      #38      +/-   ##
==========================================
- Coverage   67.90%   67.47%   -0.43%     
==========================================
  Files          15       15              
  Lines         810      861      +51     
==========================================
+ Hits          550      581      +31     
- Misses        260      280      +20     

Impacted Files	Coverage Δ
ParticleSpy/ParticleAnalysis.py	75.24% <82.75%> (+1.21%)	:arrow_up:
ParticleSpy/api.py	85.71% <100.00%> (ø)
ParticleSpy/tests/test_particle_analysis.py	100.00% <100.00%> (ø)
ParticleSpy/find_zoneaxis.py	9.41% <0.00%> (-20.00%)	:arrow_down:
ParticleSpy/ptcl_class.py	82.08% <0.00%> (-0.75%)	:arrow_down:
ParticleSpy/segptcls.py	68.35% <0.00%> (+1.26%)	:arrow_up: