Fix #13 - switch to Crossterm backend
Optimise the draw code:

• Event driven redraws for FinderView
• Reduced frame rate and caching for PlayerView

Bug fixes:

• Create a new sink when stopping an audio stream to ensure it is emptied. Clone the stream with Arc between instances. Creating a new sink is cheap and ensures the sink is cleared when we expect it to be. This fixes a race condition (non-deterministic) when toggling random / shuffle modes

Fix #13 - dynamic linking for ncurses on macOS

improvements:

• parallel loading for faster startup time
• batch loading of library on startup for better user experience
• added shuffle mode
• added config file allowing users to configure colors and keybindings
• extensive refactoring of player management:
  • single persistent instance instead of creating new instances
  • simplified data handling in cursive::user_data for better maintainability

bugs:

• added build.rs to dynamically link homebrew-provided ncurses libraries on macOS (#13)

Fixes a regression from v0.4.10 - subsequent track not queued.

Tweaks:

• Parent directories are ignored and the standalone player is loaded if there is only one child directory containing audio.
• Exit the automated player with enter.

Fixes:

• Toggling random to true on the last track would skip the track. Now the random track is queued as expected.

Implements:

• seeking
• exclude option

Fixes:

• occasional flickering between track change
• fuzzy finder errors on initial search

New:

• set your own color scheme with the --color option
• use default colors from the terminal with the --term_bg and term_color options
• open your preferred file manager with ctrl + o

Fixes:

• bug with decoding vorbis files

Improvements:

• error messages

Fixes bugs and improves error handling.

This release:

• Adds a shortchut to fuzzy search in the directory above the current directory. If you are listening to an album a parent search allows you to select another album by the same artist more conveniently.
• Modifies the way we classify items for the fuzzy-finder. This is an attempt to make the fuzzy-finder more compatible with directrories that contain non-audio or empty subdirectories.
• Refactors some code to reduce cloning.

This release adds:

• Independent volume control.
• Ability to set a default directory for faster load times.