[MOVEONLY] consensus: move amount.h into consensus

Move amount.h to consensus/amount.h.
Renames, adds missing and removes uneeded includes.

src/rpc/blockchain.cpp

@@ -5,11 +5,11 @@
 
 #include <rpc/blockchain.h>
 
-#include <amount.h>
 #include <blockfilter.h>
 #include <chain.h>
 #include <chainparams.h>
 #include <coins.h>
+#include <consensus/amount.h>
 #include <consensus/params.h>
 #include <consensus/validation.h>
 #include <core_io.h>