[kernel] Add debug names to processes

To make debugging easier, add names to processes. These are arbitrary
and supplied by the caller of process_create. The max is 31 characters
in debug configuration, and 0 in release.

definitions/objects/process.def

@@ -12,7 +12,9 @@ object process : object {
     ]
 
     # Create a new empty process
-    method create [constructor]
+    method create [constructor] {
+        param name string
+    }
 
     # Stop all threads and exit the given process
     method kill [destructor cap:kill]