0.0.1

A huge first version.

It's ready now:

• Default values specified in the class
• Values that are set during operation for class attributes
• Read only fields
• Typing support
• Checking field names (prohibit underscores at the beginning)
• Documenting fields
• The ability to validate any fields
• A separate mutex for each field
• Secret fields
• The ability to set a callback to change any of the field
• The ability to turn-off thread safety for reads of certain field
• Checking fields for conflicts
• The specified sections in the pyproject.toml file
• One or more separate toml files
• json format support
• yaml format support
• Special classes for checking through types for belonging to sets of positive or natural numbers
• Default factories
• Converting values from one to another
• The ability to share a single mutex into several fields
• Subtraction of environment variables
• Aliases support
• Individual source lists for each field, with ellipsis support

It remains to be done in the following versions:

• The ability to not assign default values in any way
• The ability to disable type checking for a class through class arguments
• Class inheritance support
• Reading parameters from the CLI
• Context manager like https://confz.readthedocs.io/en/latest/usage/context_manager.html
• If you try to use environment variables on Windows in case-dependency mode, an exception will be raised
• Check that the action is triggered only after the assignment
• Add the ability to pass a list of functions for validating values
• Add automatic detection of the value validation function's signature, and if it allows, pass the old field value as well
• Do not use quotation marks for non-string values in exceptions
• Support for dotfiles as a source
• The ability to reset the cache for sources
• Make the "for_library" method of AbstractSource abstract
• Rename change_action to action