Charex

This release includes the following changes:

- The `blessed` module is now installed as a dependency when `charex` is installed with `pip`,
- The `dt` command now displays the expected data.

- (Done.) Add every Unihan property to charex.Character.
- (Done.) Fix names for CJK Ideographs.
- (Done.) Move all Y/N properties to simple lists.
- (Done.) Move the resource file registry to `sources.json`.

The following features and changes were completed for v0.2.0:

* (Done.) Accept lower case u for character point prefix.
* (Done.) Smol text escape.
* (Done.) Tool for pulling data files.
* (Done.) Add property list.
* (Done.) Add property value list.
* (Done.) Added Unicode data properties.
* (Done.) Tool for recreating reverse normalization data.
* (Done.) Remove hardcoded properties and names from `cmd.dt()`.
* (Done.) Make `Character.na` return only the defined character name.
* (Done.) Add every non-Unihan, non-Emoji property to
charex.Character (contra Unicode API guidelines).
* (Done.) Add every Emoji property to charex.Character.
* (Done.) Add list of characters with property.
* (Done.) Organize properties in dt mode.
* (Done.) Solve Y/N vs. True/False property value question.
* (Done.) Allow insensitive and grep filtering of property values.
* (Done.) Create `Character` properties dynamically.
* (Done.) Remove long name properties.

This version adds:

* A GUI,
* Generator functions for denormalization.
* How hex and binary strings are input has been standardized across all modes. (Potential breaking change.)

Some usability tweaks for the demonstration.

Initial release.