[tma2] [Ongoing] Continue implementing modules for tma2. (#1388)

* cs: add stub sysmodule to host command shell server

* cs: implement logic for main (linker error paradise, for now)

* cs: implement more of the system module's skeleton

* htcs: update client type names for libnx pr merge

libraries/libstratosphere/include/stratosphere/scs/scs_shell_server.hpp

@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2018-2020 Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+#include <vapours.hpp>
+#include <stratosphere/os.hpp>
+#include <stratosphere/htcs.hpp>
+#include <stratosphere/scs/scs_command_processor.hpp>
+
+namespace ams::scs {
+
+    class ShellServer {
+        private:
+            htcs::HtcsPortName m_port_name;
+            os::ThreadType m_thread;
+            u8 m_buffer[64_KB];
+            CommandProcessor *m_command_processor;
+        private:
+            static void ThreadEntry(void *arg) { reinterpret_cast<ShellServer *>(arg)->DoShellServer(); }
+
+            void DoShellServer();
+        public:
+            constexpr ShellServer() = default;
+        public:
+            void Initialize(const char *port_name, void *stack, size_t stack_size, CommandProcessor *command_processor);
+            void Start();
+    };
+
+}