Codechange: Let the compile generate the master command table out of templated command traits.

This is using a non-intrusive type-traits like templated system, which
allows compile-time validation that the command table and the command
enum match up.

src/industry_cmd.cpp

@@ -42,6 +42,7 @@
 #include "error.h"
 #include "cmd_helper.h"
 #include "string_func.h"
+#include "industry_cmd.h"
 
 #include "table/strings.h"
 #include "table/industry_land.h"