Switch from intelligent save to intelligent load (#697)

Use the concept of Settings that can be:
- Created from a Device
- Stored to YAML
- Retrieved from YAML
- Added to other Settings
- Applied to a Device

src/ophyd_async/core/__init__.py

@@ -7,16 +7,6 @@
 )
 from ._device import Device, DeviceCollector, DeviceConnector, DeviceVector
 from ._device_filler import DeviceFiller
-from ._device_save_loader import (
-    all_at_once,
-    get_signal_values,
-    load_device,
-    load_from_yaml,
-    save_device,
-    save_to_yaml,
-    set_signal_values,
-    walk_rw_signals,
-)
 from ._flyer import FlyerController, StandardFlyer
 from ._hdf_dataset import HDFDataset, HDFFile
 from ._log import config_ophyd_async_logging
@@ -41,6 +31,7 @@
     StandardReadable,
     StandardReadableFormat,
 )
+from ._settings import Settings, SettingsProvider
 from ._signal import (
     Signal,
     SignalConnector,
@@ -55,9 +46,11 @@
     soft_signal_r_and_setter,
     soft_signal_rw,
     wait_for_value,
+    walk_rw_signals,
 )
 from ._signal_backend import (
     Array1D,
+    DTypeScalar_co,
     SignalBackend,
     SignalDatatype,
     SignalDatatypeT,
@@ -84,6 +77,7 @@
     in_micros,
     wait_for_connection,
 )
+from ._yaml_settings import YamlSettingsProvider
 
 __all__ = [
     "DetectorController",
@@ -96,14 +90,6 @@
     "DeviceCollector",
     "DeviceVector",
     "DeviceFiller",
-    "all_at_once",
-    "get_signal_values",
-    "load_device",
-    "load_from_yaml",
-    "save_device",
-    "save_to_yaml",
-    "set_signal_values",
-    "walk_rw_signals",
     "StandardFlyer",
     "FlyerController",
     "HDFDataset",
@@ -128,6 +114,8 @@
     "HintedSignal",
     "StandardReadable",
     "StandardReadableFormat",
+    "Settings",
+    "SettingsProvider",
     "Signal",
     "SignalConnector",
     "SignalR",
@@ -141,7 +129,9 @@
     "soft_signal_r_and_setter",
     "soft_signal_rw",
     "wait_for_value",
+    "walk_rw_signals",
     "Array1D",
+    "DTypeScalar_co",
     "SignalBackend",
     "make_datakey",
     "StrictEnum",
@@ -168,4 +158,5 @@
     "in_micros",
     "wait_for_connection",
     "completed_status",
+    "YamlSettingsProvider",
 ]