DRTVWR-589: Add initial integration test for LLLUAmanager.

The first test runs a Lua script that calls post_on(), listen_events() and
await_event() to engage in LLEventPump handshakes with the test program.

Make llluamanager.cpp testable by putting LL_TEST conditionals around lots of
viewer-internals headers and the lua_function definitions that engage them.

Since LuaListener::connect() is called by its constructor, make it a static
method that explicitly accepts the lua_State* (instead of finding it as
mState). Add that parameter to its two existing calls.

Add a debug log message when LuaListener is destroyed. This surfaced the need
to pass a no-op deleter when listen_events() constructs a LuaListener::ptr_t.

When compiled for LL_TEST, make LuaListener::mReplyPump an
LLEventLogProxyFor<LLEventStream> instead of a plain LLEventStream.

For debugging purposes, add a type string "LLEventLogProxy" for
LLEventPumps::make(). A make() call with this type will return an
LLEventLogProxyFor<LLEventStream>.

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