Filters fix, Dark color schema

Added simple dark color schema
Fixed filter for password update
Added confirmation on exit with unsaved changes.

Stable

• auto-create folders for passwords if necessary
• tested

Colors fix

v2.2.1-beta1

Colors fix.

TUI Improvements

Fixed issue with filtering.

Color schemas

Added color schemas and new CLI flags for UI:

  -dump-schema
        Print current schema and exit
  -schema string
        Color schema file

The default color schema could be printed to stdout with -dump-schema option

Added UI

Simple UI based on https://github.com/rivo/tview

1.0.0

Added makefile.