Enable global locking.

This commit:
* switches to the LabThings branch
* enables locking when config files are loaded
* Updates jogging so jog moves aren't subject to the lock, but the jog loop is.

src/openflexure_microscope_server/server/__init__.py

@@ -190,4 +190,11 @@ def _full_config_from_args(args: Namespace) -> ThingServerConfig:
         )
 
     patched_config = load_patched_config(args.config)
+    if "enable_global_lock" not in patched_config:
+        patched_config["enable_global_lock"] = True
+    if patched_config["enable_global_lock"] is not True:
+        raise ValueError(
+            "OpenFlexure Microscope Server requires `enable_global_lock` to be `true`, "
+            "and it was set to another value in the configuration file."
+        )
     return ThingServerConfig(**patched_config)

src/openflexure_microscope_server/things/stage/__init__.py

@@ -404,7 +404,7 @@ class BaseStage(lt.Thing):
             "StageThings must define their own _estimate_move_duration method"
         )
 
-    @lt.action
+    @lt.action(use_global_lock=False)
     def jog(self, stop: bool = False, **kwargs: int) -> None:
         """Make a relative move that may be interrupted by a future ``jog``.
 
@@ -471,7 +471,7 @@ class BaseStage(lt.Thing):
         command: Optional[JogCommand] = first_command
 
         # prevent others using the stage while jogging.
-        with self._hardware_lock:
+        with self._thing_server_interface.hold_global_lock(True), self._hardware_lock:
             while command is not None:
                 if command.displacement is not None:
                     self._hardware_start_move_relative(command.displacement)