script: add a slew of includes all around and drop includes from script.h

Lots of files ended up with indirect includes from script.h.

src/script/compressor.h

@@ -7,7 +7,10 @@
 #define H_BITCOIN_SCRIPT_COMPRESSOR
 
 #include "script/script.h"
+#include "serialize.h"
 
+class CKeyID;
+class CPubKey;
 class CScriptID;
 
 /** Compact serializer for scripts.