global: remove unnecessary includes from headers.

Each header should only include the other headers it needs to compile;
`devtools/reduce-includes.sh */*.h` does this.  The C files then need
additional includes if they don't compile.

And remove the entirely useless wire/onion_wire.h, which only serves to include wire/onion_wiregen.h.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

common/json_command.h

@@ -3,9 +3,7 @@
 #ifndef LIGHTNING_COMMON_JSON_COMMAND_H
 #define LIGHTNING_COMMON_JSON_COMMAND_H
 #include "config.h"
-#include <ccan/compiler/compiler.h>
 #include <common/json_parse.h>
-#include <common/jsonrpc_errors.h>
 #include <common/status_levels.h>
 
 struct command;