Remove unused function StackString() and class CCoins;
Discover some missing includes
Rename script.h/.cpp to scriptutils.h/.cpp (plus remove duplicated includes)
Move CScript class and dependencies to script/script
Separate script/interpreter
Separate script/standard
Separate CScriptCompressor
Separate script/sign
Move scriptutils.o to wallet
Move CAffectedKeysVisitor to wallet.cpp (remove ExtractAffectedKeys)
Rename scriptutils.o to wallet_ismine.o