Kernel/IPC: Use Ports and Sessions as the fundamental building block of Inter Process Communication.

All handles obtained via srv::GetServiceHandle or svcConnectToPort are references to ClientSessions.
Service modules will wait on the counterpart of those ClientSessions (Called ServerSessions) using svcReplyAndReceive or svcWaitSynchronization[1|N], and will be awoken when a SyncRequest is performed.

HLE Interfaces are now ClientPorts which override the HandleSyncRequest virtual member function to perform command handling immediately.

src/core/hle/kernel/kernel.h

@@ -31,22 +31,24 @@ enum KernelHandle : Handle {
 };
 
 enum class HandleType : u32 {
-    Unknown = 0,
+    Unknown         = 0,
 
-    Session = 2,
-    Event = 3,
-    Mutex = 4,
-    SharedMemory = 5,
-    Redirection = 6,
-    Thread = 7,
-    Process = 8,
-    AddressArbiter = 9,
-    Semaphore = 10,
-    Timer = 11,
-    ResourceLimit = 12,
-    CodeSet = 13,
-    ClientPort = 14,
-    ServerPort = 15,
+
+    Event           = 3,
+    Mutex           = 4,
+    SharedMemory    = 5,
+    Redirection     = 6,
+    Thread          = 7,
+    Process         = 8,
+    AddressArbiter  = 9,
+    Semaphore       = 10,
+    Timer           = 11,
+    ResourceLimit   = 12,
+    CodeSet         = 13,
+    ClientPort      = 14,
+    ServerPort      = 15,
+    ClientSession   = 16,
+    ServerSession   = 17,
 };
 
 enum {
@@ -82,7 +84,7 @@ public:
      */
     bool IsWaitable() const {
         switch (GetHandleType()) {
-        case HandleType::Session:
+        case HandleType::ServerSession:
         case HandleType::ServerPort:
         case HandleType::Event:
         case HandleType::Mutex: