[Sketches] Add delay to prevent initial serial corruption

Signed-off-by: Christopher Hall <christopherhall.hsw@gmail.com>
[Sketches] New begin/end sequence to improve COG 2 contrast

Signed-off-by: Christopher Hall <christopherhall.hsw@gmail.com>
[PlatformWithOS] New begin/end sequence to improve COG 2 contrast

Signed-off-by: Christopher Hall <christopherhall.hsw@gmail.com>