Multiple breaking changes

[tcarion]

This PR brings several significant changes to Flexpart.jl:

• The FlexpartDir object has been refactored to FlexpartSim
• The NetCDFF version has been forced to 4.5.3 (solves issue Segmentation fault with [email protected] #9)
• Ensemble runs works better
• FlexExtract has been moved to a separate repo, since both modules can work independently, and very little code was shared between both.
• The internal FlexpartOptions code has been move out of its own module

[codecov-commenter]

Codecov Report

Patch coverage: 65.85% and project coverage change: +0.64 🎉

Comparison is base (d803176) 62.50% compared to head (6d517ed) 63.14%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #10      +/-   ##
==========================================
+ Coverage   62.50%   63.14%   +0.64%     
==========================================
  Files          10        9       -1     
  Lines         680      540     -140     
==========================================
- Hits          425      341      -84     
+ Misses        255      199      -56     

Impacted Files	Coverage Δ
src/outputs.jl	36.00% <20.00%> (-1.50%)	⬇️
src/run.jl	38.46% <33.96%> (-13.01%)	⬇️
src/flexpartsim.jl	67.27% <67.27%> (ø)
src/abstracts.jl	64.28% <75.00%> (-4.95%)	⬇️
src/inputs.jl	84.61% <84.61%> (ø)
src/miscellaneous.jl	86.79% <100.00%> (ø)
src/options.jl	81.30% <100.00%> (ø)

... and 1 file with indirect coverage changes

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