[MOVEONLY] consensus: move amount.h into consensus

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

src/primitives/transaction.cpp

@@ -5,6 +5,7 @@
 
 #include <primitives/transaction.h>
 
+#include <consensus/amount.h>
 #include <hash.h>
 #include <tinyformat.h>
 #include <util/strencodings.h>

src/primitives/transaction.h

@@ -7,7 +7,7 @@
 #define BITCOIN_PRIMITIVES_TRANSACTION_H
 
 #include <stdint.h>
-#include <amount.h>
+#include <consensus/amount.h>
 #include <script/script.h>
 #include <serialize.h>
 #include <uint256.h>