More work on reducing script dependencies. I'm not sure if this is wanted yet, if not I'm fine with holding off.
This allows CScript to work without knowledge of CTxDestination. Most of the dependencies on key.h are dropped, and a boost dependency is dropped as well. Next obvious steps would be to do the same for CPubKey, move SetMultisig() out, etc. This seemed like a good stopping point before continuing with those.
I've tried to keep up with the script movement PRs, but looks like I missed some. I'll have a look at this again tomorrow, very possible that this was a completely duplicated effort.
Yes it looks like some coordination is needed to make sure we're all on the same page. For ages hardly anyone touched the script headers at all but recently there has been a flurry of activity.
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