Oreum-core

+ New model reload capability
+ Improved file handling throughout
+ General consolidation throughout

+ [x] Minor updates to requirements
+ [x] improved `curate.SimpleStringIO`

+ [x] Overhauled `BasePYMC3Model` to save traces to `idata` only
+ [x] Overhauled `_create_idata` accordingly to allow creation from prior, trace or posterior idata with logical dependencies
+ [x] Overhauled `update_idata` accordingly to allow attaching an externally loaded idata object (model reinstantiation)
+ [x] Renamed all relevant functions to use `idata` rather than `azid`

+ dropped nltk and related text processing - will create a new package for that if needed
+ general tidy of unused imports
+ cleaned up inits

+ Added new custom distribution `model.ZeroInflatedLogNormal`
+ Minor improvements to model plots

removed unused packages
updated orderedset to ordered-set (the maintained replacement)
autoupdate precommit