Impl'd IsUserAccountSwitchLocked, SetAudioOutVolume, GetAudioOutVolume & Partial impl of GetAccumulatedSuspendedTickChangedEvent

IPC-100 was changed to InitializeApplicationInfoOld instead of InitializeApplicationInfo. IPC-150 makes an indentical call to IPC-100 however does extra processing. They should not have the same name as it's quite confusing to debug.

src/core/file_sys/control_metadata.cpp

@@ -87,6 +87,10 @@ u64 NACP::GetDefaultJournalSaveSize() const {
     return raw.user_account_save_data_journal_size;
 }
 
+bool NACP::GetUserAccountSwitchLock() const {
+    return raw.user_account_switch_lock == 1;
+}
+
 u32 NACP::GetSupportedLanguages() const {
     return raw.supported_languages;
 }