Proper V13 Compatibility

V13 Actual Compatibility. BREAKING
So the button was broken for masterplan import in V13 because of the application V2 changes.

So today has been updating to V13.
This is a breaking change due to how App V2 works, so have bumped version. This release is not compatible with Foundry versions <13

No actual new functionality, just a working importer. This has taken all day and I am /very/ salty about it.

Drag ruler integration is removed in this version, as the Drag Ruler mod hasn't worked in several foundry versions and is now system inbuilt functionality.
Fixes #31