Support Truecolor#5

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Mongey wants to merge 6 commits intoblinksh:ios-statefrom

Mongey:cm-cp-truecolor

Commits on Jul 31, 2018

Add true color support.

kangjianbin
authored and
Mongey
committed
Make Terminal::Renditions smaller, and its members private.

cgull
authored and
Mongey
committed
Overlays were getting set to the wrong colors. Fix.

cgull
authored and
Mongey
committed
Minor SGR printf type signedness fixes.

cgull
authored and
Mongey
committed
Make Renditions::sgr() more compact in both code and output.

cgull
authored and
Mongey
committed
Fix issue with incorrect true-color background erase colors.

cgull
authored and
Mongey
committed