Implement methods for retrieving ion mobility arrays

[MKoesters]

• get_tims_tof_ion_mobility
• get_array for getting any available array
• get_all_arrays_in_spec() retrieve a list of all binary array names in current spec

[codecov[bot]]

Codecov Report

Merging #252 into dev will increase coverage by 0.12%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev     #252      +/-   ##
==========================================
+ Coverage   84.18%   84.30%   +0.12%     
==========================================
  Files          32       32              
  Lines        3698     3727      +29     
==========================================
+ Hits         3113     3142      +29     
  Misses        585      585              

Impacted Files	Coverage Δ
pymzml/spec.py	77.83% <100.00%> (+0.68%)	:arrow_up:
tests/main_spec_test.py	99.04% <100.00%> (+0.01%)	:arrow_up:

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