color: move '_effect_str' function into the core module

color: move configstyles into the core module The extension is getting thinner as we speak!

color: rework conditional 'valideffect' Not very important, but the full conditional is not that hard to follow and having it unified make the function role a bit clearer in my opinion.

color: move 'valideffect' function into the core module

color: move '_terminfo_params' into the core 'color' module On step closer to have color in core.

color: move '_effect' mapping into core This is the second things we can move into core safely.

color: spread '_effect' values for readability We move to our "usual" one value per line style.

merge with stable

update: clarify that -C and -c are mutually exclusive This makes it clear in both the synopsis and in the verbose output that -C and -c are mutually exclusive. It also restructures the verbose output a little so it's better prepared for a third option (--merge). This patch also reorders the options to match the flag table.

update: move check for dirty wdir into hg.updatetotally() The function has a "check" parameter that's currently unused, and it makes sense to me to have it honor it. That way other callers than commands.update() could set it if they needed.