v0.5.0

[hannesrichter]

These changes are included:

• updated dependencies to use sqlalchemy2
• reworked test fixtures and removed xprocess
• use SQLite in memory if nothing is configured
• replaced usage of uuid4 with uuid1
• adding files is now handled by the caller, not the persistence abstraction
• cleaned up how dates are formatted throughout the API. now everything is an iso string and not any date time objects with implicit cast.
• do not start the process if the database connection cannot be established. This helps when orchestrating docker setups with compose.
• increased the default body request body size of waitress to 8gigs