cli-visualizer

Using cmake for the build process instead of Makefile

• Adding support for gradients. Note, by default this will reset terminal colors.
• Adding support for smoother transitions between colors when gradients is enabled.
• Fixing when building with newer versions of ncurses.
• Using a larger color range for ncurses.
• Slight tweak to default color schemes.
• Various fixes and readme updates.

• Fixed bug with ncurses version 6.0.20170401 which would cause 256-colors to show a blank screen.
• Added control to toggle mono/stereo
• Added flag to force ncursesw

• Fixed settings colors for non-256 color terminals
• Improved checks and defaults for pulseaudio
• Defaulting to mpd source when pulseaudio not found
• Various small fixes

• Correctly checking for libpulse support

• Enabling pulse audio by default
• Adding support for utf-8 chars in the config