Libspinscale: Initial top-level SMO port to coroutine framework

We haven't ported everything. Just the top-level methods. We'll
dig in to the leaf stuff later. Surprisingly, this all went without
any real difficulties.

Runs like a charm on first try.

stimBuffApis/xcbWindow/xcbWindow.cpp

@@ -8,7 +8,7 @@
 #include <xcb/xcb.h>
 #include <user/senseApiDesc.h>
 #include <user/deviceAttachmentSpec.h>
-#include <spinscale/callback.h>
+#include <spinscale/cps/callback.h>
 #include <xcbXorg/xcbXorg.h>
 #include "xcbWindow.h"
 
@@ -277,7 +277,7 @@ static int xcbWindow_finalizeInd(void)
 static void xcbWindow_attachDeviceReq(
     const std::shared_ptr<smo::device::DeviceAttachmentSpec>& desc,
 	const std::shared_ptr<sscl::ComponentThread>& componentThread,
-	sscl::Callback<smo::stim_buff::sal_mlo_attachDeviceReqCbFn> cb
+	sscl::cps::Callback<smo::stim_buff::sal_mlo_attachDeviceReqCbFn> cb
     )
 {
 	// Not used yet, but may be used later.
@@ -302,7 +302,7 @@ static void xcbWindow_attachDeviceReq(
 
 static void xcbWindow_detachDeviceReq(
     const std::shared_ptr<smo::device::DeviceAttachmentSpec>& spec,
-	sscl::Callback<smo::stim_buff::sal_mlo_detachDeviceReqCbFn> cb
+	sscl::cps::Callback<smo::stim_buff::sal_mlo_detachDeviceReqCbFn> cb
     )
 {
     auto it = std::find_if(g_attachedWindows.begin(), g_attachedWindows.end(),