Use json api

[pheerai]

As mentioned in #31, this migrates to the newly-detected JSON Api

This includes the following changes:

• Add JSON parser + tests
• Abstract away parser implementation (Allows for easy swappable parser, i.e. "legacy" XML-parser by command line parameter)
• Re-structure some source files

[codecov[bot]]

Codecov Report

Merging #32 into develop will decrease coverage by 0.1%. The diff coverage is 99.53%.

@@            Coverage Diff             @@
##           develop     #32      +/-   ##
==========================================
- Coverage     99.7%   99.6%   -0.09%     
==========================================
  Files            4       5       +1     
  Lines          324     246      -78     
==========================================
- Hits           323     245      -78     
  Misses           1       1

Impacted Files	Coverage Δ
...bayernfahrplan/fahrplanparser/data/departureData.d	100% <100%> (ø)
...rce/bayernfahrplan/fahrplanparser/json/jsonUtils.d	100% <100%> (ø)
.../bayernfahrplan/fahrplanparser/data/substitution.d	100% <100%> (ø)
...ce/bayernfahrplan/fahrplanparser/data/exceptions.d	100% <100%> (ø)
...ce/bayernfahrplan/fahrplanparser/json/jsonParser.d	99.06% <99.06%> (ø)

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[pheerai]

This should basically be done @ghost91-: please re-review.