Introduce the new type 'ncdirect', a stripped-down 'notcurses'
suitable for inline modification of regular output. Used the new
type because otherwise there were going to be if(directmode) checks
everywhere. Direct mode encompasses only colorizing and styling.
Add new man page notcurses_directmode(3). Add new section to README.
Add new PoC using direct mode RGB. Update demo table summary to use
direct mode.
* sync up some docs #244
* sync README and man page
* notcurses_output() man page work
* pull attr/channels from output functions #244
* witherworm: clean up explicit moves #244
* still more man page work
* notcurses_lines, last of the man pages i think
* panelreel man page #244
* debian: ruby-ronn->pandoc
* debian: full multiarch compliance
* debian: symbols file
* pandoc: fix syntax for lexgrog
* fm6.mkv: strip audio
* pandoc: fix up apropos man syntax #249
* ncurses_lines man page
