Implement walk delay

[pheerai]

Missing:

• [x] Realtime data usage, if any
• [x] Better module structure
• [x] unittests
• [x] import cleanup As mentioned in #3, this implements the possibility to define a filter for departures that are unlikely to be caught.

This includes the following changes:

• Add a filtering mechanism
• Add a configuration option
• Major restructuring of the module system to ease up maintenance

[codecov[bot]]

Codecov Report

Merging #27 into develop will decrease coverage by 9.1%. The diff coverage is 99.65%.

@@             Coverage Diff             @@
##           develop      #27      +/-   ##
===========================================
- Coverage      100%   90.91%   -9.09%     
===========================================
  Files            2        5       +3     
  Lines          181      374     +193     
===========================================
+ Hits           181      340     +159     
- Misses           0       34      +34

Impacted Files	Coverage Δ
source/fahrplanparser/package.d	34% <ø> (ø)
source/fahrplanparser/substitution.d	100% <ø> (ø)
source/fahrplanparser/xmlutils.d	100% <100%> (ø)
source/fahrplanparser/exceptions.d	100% <100%> (ø)
source/fahrplanparser/parser.d	99.54% <99.54%> (ø)

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