fs.mitm: WIP LayeredFS impl (NOTE: UNUSABLE ATM)

Also greatly refactors libstratosphere, and does a lot of other things.
There is a lot of code in this one.

stratosphere/fs_mitm/source/mitm_query_service.cpp

@@ -0,0 +1,28 @@
+#include <switch.h>
+#include <stratosphere.hpp>
+#include "mitm_query_service.hpp"
+
+static std::vector<u64> g_known_pids;
+static std::vector<u64> g_known_tids;
+static HosMutex g_pid_tid_mutex;
+
+Result MitMQueryUtils::get_associated_tid_for_pid(u64 pid, u64 *tid) {
+    Result rc = 0xCAFE;
+    g_pid_tid_mutex.Lock();
+    for (unsigned int i = 0; i < g_known_pids.size(); i++) {
+        if (g_known_pids[i] == pid) {
+            *tid = g_known_tids[i];
+            rc = 0x0;
+            break;
+        }
+    }
+    g_pid_tid_mutex.Unlock();
+    return rc;
+}
+
+void MitMQueryUtils::associate_pid_to_tid(u64 pid, u64 tid) {
+    g_pid_tid_mutex.Lock();
+    g_known_pids.push_back(pid);
+    g_known_tids.push_back(tid);
+    g_pid_tid_mutex.Unlock();
+}