Mltraq

* Added missing `__init__.py` file

* Cleanup and update of dependencies

* Improved `BunchStore` class overloading also `__delitem__` and `__iter__`
* Added SVG optimizer (smaller SVGs, no timestamps that cause git changes)

* Default value for `create_tables` of `Database` class constructor changed to False, allowing the usage of this class also for use cases beyond managing MLtraq DBs.
* Added class `BunchStore` to handle a `Bunch` class transparently on memory and filesystem.
* Added blog post on how to use `return_as=generator_unordered` and fail fast (blog/posts/011)
* Added blog post on how to handle secrets with dynamic `Options` (blog/posts/012)
* Added blog post on `BunchStore` to handle caches and more (blog/posts/013)

* Fixed some typos in tests and docs
* Added blog post on `BunchEvent` (blog/posts/010)

* Added `BunchEvent` type, a Bunch with function triggers for setters and getters