pwmgr

Remove dependence on exernal font file. Used binary_to_compressed_c
utility to convert Roboto Medium font into compressed array so that it
can be included directly within the source code.

Add missing FindSodium.cmake file. Add minor fix for clear filter button
and move it next to the filter text box.

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.

Using "gui_test" as a starting point.