core plugins should be registered *after* the basic commands are registered

[ret2libc]

Work environment

rizin 0.2.0-git @ linux-x86-64
commit: c02f79753e40d9089b8708fb33a4b5f0ab8590f6, build: 2021-02-23__15:16:15

Expected behavior

Core plugins should be registered after the basic commands are added.

Actual behavior

Core plugins have precedence over basic commands, so for example java is registered before anything else.

Steps to reproduce the behavior

Core plugins are registered in rz_cmd_new immediately after creating the root command descriptor, which means that a core plugin could register commands that are supposed to be "core" ones (e.g. w, p, etc.).

See cmd_api.c:

RZ_API RzCmd *rz_cmd_new(bool has_cons, bool add_core_plugins) {
	...
	cmd->root_cmd_desc = create_cmd_desc(cmd, NULL, RZ_CMD_DESC_TYPE_GROUP, "", &root_help, true);
	if (add_core_plugins) {
		rz_core_plugin_init(cmd);
	}
	rz_cmd_macro_init(&cmd->macro);
	rz_cmd_alias_init(cmd);
	return cmd;
}

[wargio]

We probably need to sort the commands once newshell is initialized.