Work in progress

This work extends AIStateMachine to run multiplex() in the thread
that calls run(), cont() or set_state(). Note that all three
eventually call locked_cont(), so thats where multiplex() is called
from. Calling multiplex() means "running the state machine", as in
"calling multiplex_impl".

Currently only LLURLRequest uses this feature, and then only
for the HTTPGetResponder, and well only for the initializing,
start up and normal finish states.

A current/remaining problem is that we run into a situation where
the curl thread runs a statemachine to it's finish and kills it,
while the main thread is also 'running' it and tries to call
multiplex while the statemachine isn't running anymore.

indra/llmessage/aicurleasyrequeststatemachine.h

@@ -35,6 +35,15 @@
 #include "aitimer.h"
 #include "aicurl.h"
 
+enum curleasyrequeststatemachine_state_type {
+  AICurlEasyRequestStateMachine_addRequest = AIStateMachine::max_state,
+  AICurlEasyRequestStateMachine_waitAdded,
+  AICurlEasyRequestStateMachine_timedOut,	// This must be smaller than the rest, so they always overrule.
+  AICurlEasyRequestStateMachine_removed,	// The removed states must be largest two, so they are never ignored.
+  AICurlEasyRequestStateMachine_removed_after_finished,
+  AICurlEasyRequestStateMachine_bad_file_descriptor
+};
+
 // A curl easy request state machine.
 //
 // Before calling cersm.run() initialize the object (cersm) as follows: