Entmoot

Added
- allow consistent variable names for gurobi model and dimensions

Changed
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Fixed
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Added
- support for gurobi environments for integration with server license

Changed
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Fixed
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Added
- support for categorical features
- uncertainty quantification for categorical features
- added testing for inputs and consistency

Changed
- variable handling in optimization model, i.e. dictionaries for continuous and categorical variables
- default parameters values of LGBM model changed

Fixed
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Added
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Changed
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Fixed
- fix installation process

Added
- support for additional gurobi constraints
- additional scaling options for acquisition function

Changed
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Fixed
- fix passing of `acq_optimizer_kwargs`

Added
- arxiv *.bib reference

Changed
- variable names for better readability
- minor model modifications

Fixed
- fix support for initial data points in [entmoot_minimize.py](https://github.com/cog-imperial/entmoot/blob/master/entmoot/optimizer/entmoot_minimize.py)