Minimize includes in header files to what they depend on

src_plugins/erc721/erc721_plugin.c

@@ -1,7 +1,10 @@
 #ifdef HAVE_NFT_SUPPORT
 
+#include <string.h>
 #include "erc721_plugin.h"
 #include "eth_plugin_internal.h"
+#include "eth_plugin_interface.h"
+#include "ethUtils.h"
 
 static const uint8_t ERC721_APPROVE_SELECTOR[SELECTOR_SIZE] = {0x09, 0x5e, 0xa7, 0xb3};
 static const uint8_t ERC721_APPROVE_FOR_ALL_SELECTOR[SELECTOR_SIZE] = {0xa2, 0x2c, 0xb4, 0x65};