pwmgr

Revamp display widgets. Use a listbox on the left panel and a multiline
text box in the main right panel. Bump version to 0.2.0.

Tokenize a filter criteria and then search the catalog for feach filter
criteria token.

Significant improvements including reading input from encrypted file.
Also added crypto utility to en/decrypt a file.

Improved filtering and added parsing input from a plaintext file.

Hasty WIP commit.