Includes: Cleanup around net main and wallet

-Move from .h to .cpp: in main, net and wallet
-Remove unnecessary #include "main.h"
-Cleanup some wallet files includes

src/wallet/wallet.cpp

@@ -11,9 +11,13 @@
 #include "coincontrol.h"
 #include "consensus/consensus.h"
 #include "consensus/validation.h"
+#include "key.h"
+#include "keystore.h"
 #include "main.h"
 #include "net.h"
 #include "policy/policy.h"
+#include "primitives/block.h"
+#include "primitives/transaction.h"
 #include "script/script.h"
 #include "script/sign.h"
 #include "timedata.h"

src/wallet/wallet.h

@@ -7,10 +7,6 @@
 #define BITCOIN_WALLET_WALLET_H
 
 #include "amount.h"
-#include "key.h"
-#include "keystore.h"
-#include "primitives/block.h"
-#include "primitives/transaction.h"
 #include "streams.h"
 #include "tinyformat.h"
 #include "ui_interface.h"

src/wallet/wallet_ismine.h

@@ -6,7 +6,6 @@
 #ifndef BITCOIN_WALLET_WALLET_ISMINE_H
 #define BITCOIN_WALLET_WALLET_ISMINE_H
 
-#include "key.h"
 #include "script/standard.h"
 
 #include <stdint.h>

src/wallet/walletdb.cpp

@@ -7,7 +7,7 @@
 
 #include "base58.h"
 #include "consensus/validation.h"
-#include "main.h"
+#include "main.h" // For CheckTransaction
 #include "protocol.h"
 #include "serialize.h"
 #include "sync.h"

src/wallet/walletdb.h

@@ -9,7 +9,6 @@
 #include "amount.h"
 #include "wallet/db.h"
 #include "key.h"
-#include "keystore.h"
 
 #include <list>
 #include <stdint.h>