Support for Bob's adjustable inserters

[theunkn0wn1]

Describe the bug
When loading a blueprint that has bob's adjustable inserters in it, draftsman emits warnings and drops the fields.

Current Behavior
Example blueprint string:

0eNqlkt1ugzAMhd/F1wkCwl95lWmqQrBaqySgJExDKO++AFI1dd16sbs48fniY3uFbphxsmQ8tCuQGo2D9m0FRxcjh+3OLxNCC+RRAwMj9RZJ51B3A5kL11JdySAXEBiQ6fET2iy8M0DjyRMevD1YzmbWHdqYcCd1NrK4uqLzET+NLmpGs30cObxKy6RksMSjyJukDIH9YOV3lsWeOy/VjZNxaH18fYE8RSSDniyqIyfCejtO5wdVuguyJE9Flj+tQvzdm2d1iJfWin9Yqx+tVVFA6jb/Yo5nYZvaPuf221owGGSHcRWgRz3G8AOtO3rVZEV9yuumOqUiLUL4AlNdvN8=

example reproducing python code:

from draftsman.blueprintable import Blueprint
from pathlib import Path


print("loading blueprint...")
target = Path("./demo.blueprint")
blueprint = Blueprint()

blueprint.load_from_string(target.read_text())

print("loaded blueprint!!")
print("sinking blueprint to test round trip safeness")
output = Path("./demo.round-trip.blueprint")
output.write_text(blueprint.to_string())
print("done!!")

output:

loading blueprint...
/home/orion/projects/factorio/blueprint_hacks/main.py:9: DraftsmanWarning: <class 'draftsman.prototypes.inserter.Inserter'> has no attribute 'drop_position'
  blueprint.load_from_string(target.read_text())
/home/orion/projects/factorio/blueprint_hacks/main.py:9: DraftsmanWarning: <class 'draftsman.prototypes.inserter.Inserter'> has no attribute 'pickup_position'
  blueprint.load_from_string(target.read_text())
loaded blueprint!!
sinking blueprint to test round trip safeness
done!!

When such blueprints are exported, the position fields are lost.
Thus, draftsman emits malformed blueprints that would require manual post-processing to fix.

Expected behavior
Draftsman should pass through any fields it isn't aware of, as they may belong to mods draftsman doesn't have specific support for.

Additional context
This issue relates to Bob's adjustable inserters and more generally any AngelBobs derived modpack.

Please also include the following:
factorio-draftsman = "^1.1.1"

$ python3 --version                                                                                                                                                                                                                                                                                                                                                                 [14:43:09]
Python 3.10.12

[theunkn0wn1]

this applies to both inserters and filter inserters.
and the same issue exists for Furnace too

loading blueprint...
/home/orion/projects/factorio/blueprint_hacks/main.py:9: DraftsmanWarning: <class 'draftsman.prototypes.inserter.Inserter'> has no attribute 'drop_position'
  blueprint.load_from_string(target.read_text())
/home/orion/projects/factorio/blueprint_hacks/main.py:9: DraftsmanWarning: <class 'draftsman.prototypes.inserter.Inserter'> has no attribute 'pickup_position'
  blueprint.load_from_string(target.read_text())
loaded blueprint!!
sinking blueprint to test round trip safeness
done!!

[redruin1]

Thanks for the report, I forgot about these attributes. I'll patch this into 2.0. You mention that Furnaces also have this issue; what attributes is Draftsman complaining about in that case?