LogManager: implement system module, client api, logging api (#1617)

Some notes:

* Unless `atmosphere!enable_log_manager` is true, Nintendo's log manager will be used instead.
  * This prevents paying memory costs for LM when not enabling logging.
  * To facilitate this, Atmosphere's log manager has a different program id from Nintendo's.
  * `atmosphere!enable_htc` implies `atmosphere!enable_log_manager`.
* LogManager logs to tma, and the SD card (if `lm!enable_sd_card_logging` is true, which it is by default).
* Binary logs are saved to `lm!sd_card_log_output_directory`, which is `atmosphere/binlogs` by default.

libraries/libstratosphere/include/stratosphere.hpp

@@ -19,6 +19,9 @@
 /* libvapours (pulls in util, svc, results). */
 #include <vapours.hpp>
 
+/* Libstratosphere diagnostics. */
+#include <stratosphere/diag.hpp>
+
 /* Libstratosphere definitions. */
 #include <stratosphere/ams/impl/ams_system_thread_definitions.hpp>
 
@@ -62,6 +65,7 @@
 #include <stratosphere/kvdb.hpp>
 #include <stratosphere/ldr.hpp>
 #include <stratosphere/lr.hpp>
+#include <stratosphere/lm.hpp>
 #include <stratosphere/map.hpp>
 #include <stratosphere/ncm.hpp>
 #include <stratosphere/nim.hpp>