[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/htc.hpp

@@ -17,3 +17,7 @@
 
 #include <stratosphere/htc/server/htc_htcmisc_hipc_server.hpp>
 #include <stratosphere/htc/server/htc_htcmisc_channel_ids.hpp>
+
+#include <stratosphere/htc/tenv/htc_tenv_types.hpp>
+#include <stratosphere/htc/tenv/htc_tenv.hpp>
+#include <stratosphere/htc/tenv/htc_tenv_service_manager.hpp>