To-do list

v0.2.0

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Fix thermo methods
- We have swapped the order of the inputs from xVT to VTx in the models but it is not reflected in the methods
- Rename some of the property methods (getting rid of the 'get' prefix for example
Update all models to use new input format
Add more comments in the code base according to Julia's recommended format
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Add ~~OpenSAFT~~ Clapeyron to Julia repository