kern: implement SvcSleepThread for ns > 0

kern: implement KPageTableBase::CopyHeapToHeap(WithoutCheckDestination)

kern: add KPageTableBase::CopyMemory Linear <-> User and Linear <-> Kernel

kern: mostly implement thread exit

kern/ipc: fix bug in SendMessage

kern/ipc: implement remaining KServerSession reply code

kern: add SvcExitThread, SvcSendAsyncRequestWithUserBuffer, SvcReplyAndReceiveWithUserBuffer

kern/ipc: implement most of reply

kern/ipc: implement SendReply, declare SendMessage

os: fix building with new svc defs

kern/ipc: add Atmosphere's mitm pid passthrough logic

ipc/receive: trivially correct result return codeflow

kern/ipc: finish Receive part of ReplyAndReceive

ipc: add MapAlias processing logic for Receive

ipc::Reply -> implement Pointer handling logic

ipc::Reply -> add raw data copy logic

kern: implement remaining non-KServerSession:: part of Reply/Receive

kern: partially implement Receive half of ReplyAndReceive

kern: implement SvcSendSyncRequest(WithUserBuffer)

kern: implement SvcArbitrateLock, SvcArbitrateUnlock

kern: skeleton SvcReplyAndReceive

kern: partially implement SvcSignalProcessWideKey

kern: implement SvcCreateThread, SvcStartThread

kern: implement SvcMapMemory

kern: implement SvcAcceptSession

kern: implement SvcWaitSynchronization

kern: implement KEvent, KWritableEvent, KServerSession::OnClientClosed

kern: implement SvcCloseHandle

kern: SvcConnectToNamedPort

kern: svcOutputDebugString, svcGetThreadPriority, svcGetThreadId