lua: don't suspend core by default during script execution

This changes behavior somewhat. The old behavior can be restored by
running "mp.use_suspend=true". It was originally introduced for the OSC,
but I can't reproduce whatever misbehavior I was seeing.

(See mp.suspend()/resume() for explanations what the suspend mechanism
does.)

DOCS/interface-changes.rst

@@ -23,6 +23,7 @@ Interface changes
     - deprecate "track-list/N/audio-channels" property (use
       "track-list/N/demux-channel-count" instead)
     - remove write access to "stream-pos", and change semantics for read access
+    - Lua scripts now don't suspend mpv by default while script code is run
  --- mpv 0.16.0 ---
     - change --audio-channels default to stereo (use --audio-channels=auto to
       get the old default)

DOCS/man/lua.rst

@@ -412,7 +412,7 @@ are useful only in special situations.
     from displaying the next video frame, so that you don't get blocked when
     trying to access the player.
 
-    This is automatically called by the event handler.
+    Before mpv 0.17.0, this was automatically called by the event handler.
 
 ``mp.resume()``
     Undo one ``mp.suspend()`` call. ``mp.suspend()`` increments an internal
@@ -423,10 +423,6 @@ are useful only in special situations.
     This resets the internal suspend counter and resumes the player. (It's
     like calling ``mp.resume()`` until the player is actually resumed.)
 
-    You might want to call this if you're about to do something that takes a
-    long time, but doesn't really need access to the player (like a network
-    operation). Note that you still can access the player at any time.
-
 ``mp.get_wakeup_pipe()``
     Calls ``mpv_get_wakeup_pipe()`` and returns the read end of the wakeup
     pipe. (See ``client.h`` for details.)
@@ -449,8 +445,6 @@ are useful only in special situations.
     ``mp.get_wakeup_pipe()`` if you're interested in properly working
     notification of new events and working timers.
 
-    This function calls ``mp.suspend()`` and ``mp.resume_all()`` on its own.
-
 ``mp.enable_messages(level)``
     Set the minimum log level of which mpv message output to receive. These
     messages are normally printed to the terminal. By calling this function,

player/lua/defaults.lua

@@ -438,7 +438,7 @@ local function call_event_handlers(e)
     end
 end
 
-mp.use_suspend = true
+mp.use_suspend = false
 
 function mp.dispatch_events(allow_wait)
     local more_events = true