pgl: Reimplement the pgl sysmodule (#896)

* pgl: add skeleton folder to stratosphere

* pgl: Add service interface for IShellInterface

* pgl: begin skeletoning shell service, implement two commands.

* pgl: Implement three more commands.

* pgl: implement bool tracking commands

* pgl: Implement TriggerApplicationSnapShotDumper

* pgl: implement InitializeProcessControlTask

* pgl: Implement pgl::srv::Initialize

* pgl: Implement main()

* pgl: Implement (Get)ShellEventObserver

* pgl: implement LaunchProgramFromHost, GetHostContentMetaInfo

* pgl: Implement ProcessControlTask

* settings: fix duplicate object name

* pgl: fix minor bugs in impl

libraries/libstratosphere/include/stratosphere/pm/pm_shell_api.hpp

@@ -23,6 +23,12 @@
 namespace ams::pm::shell {
 
     /* Shell API. */
-    Result LaunchProgram(os::ProcessId *out_process_id, const ncm::ProgramLocation &loc, u32 launch_flags);
+    Result LaunchProgram(os::ProcessId *out, const ncm::ProgramLocation &loc, u32 launch_flags);
+    Result TerminateProcess(os::ProcessId process_id);
+    Result GetProcessEventEvent(os::SystemEvent *out);
+    Result GetProcessEventInfo(ProcessEventInfo *out);
+    Result GetApplicationProcessIdForShell(os::ProcessId *out);
+    Result BoostSystemMemoryResourceLimit(u64 size);
+    Result EnableApplicationExtraThread();
 
 }