[PATCH v4 0/2] less: fully implement -R

[FriendlyNeighborhoodShane]

Reposting without major changes because it hasn't recieved any responses
in 2 weeks.

The switch was half-implemented earlier and it only used to trim escape
sequences. This patch series implements the feature fully i.e. makes
it emit color (SGR) sequences raw, and fixes other behaviour around it.

Changes from v1:
 - count_colctrl does better validation for SGR sequences

Changes from v2:
 - fixed corrupted patches (accidentally edited before sending)
 - fix code style

Changes from v3:
 - fixed regex in commit message