Make Train and AS5100.2 Appendix C example

[ccaprani]

• Added the calculations for Appendix C of AS5100.2 to the docs
• Added functionality to have static loads as well as moving vehicle loads in a BridgeAnalysis
• Renamed the from_convoy to make_train and moved outside Vehicle class.
• Updated make_train example accordingly.

[codecov-commenter]

Codecov Report

Merging #47 (109d34d) into main (a921d30) will increase coverage by 0.41%.
The diff coverage is 81.81%.

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@@            Coverage Diff             @@
##             main      #47      +/-   ##
==========================================
+ Coverage   80.22%   80.64%   +0.41%     
==========================================
  Files          12       12              
  Lines        1229     1235       +6     
==========================================
+ Hits          986      996      +10     
+ Misses        243      239       -4     

Files Changed	Coverage Δ
src/pycba/analysis.py	78.37% <ø> (ø)
src/pycba/beam.py	85.71% <ø> (ø)
src/pycba/inf_lines.py	72.22% <ø> (ø)
src/pycba/load.py	91.69% <ø> (ø)
src/pycba/results.py	99.21% <ø> (ø)
src/pycba/utils.py	87.50% <ø> (ø)
src/pycba/bridge.py	36.15% <71.42%> (ø)
src/pycba/vehicle.py	75.90% <83.33%> (ø)
src/pycba/__init__.py	100.00% <100.00%> (ø)
tests/test_bridge.py	100.00% <100.00%> (ø)

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