Switching to cmake

Using cmake for the build process instead of Makefile

Version 1.7

• 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.

1.6

• 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

Version 1.5

• 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

Version 1.4

• Correctly checking for libpulse support

Version 1.3

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

Version 1.2

Adding a fix for building on raspberry pi 3

Version 1.1

v1.1

Moving signal handling setup to after first read to prevent CTRL-C fr…