Remove threedi-modelchecker wheel

[leendertvanwolfswinkel]

If I understand correctly, 3Di Models & Simulations is shipped with its own threedi-modelchecker wheel. For this reason, there may be differences in the checker results between 3Di Models & Simulations and the processing algorithm "Check schematisation" that is part of 3Di Results Analysis (repo nens/ThreeDiToolbox). This is confusing.

Please make it so that 3Di Models & Simulations uses the threedi-modelchecker that is provided by 3Di Results Analysis, instead of using its own wheel.

If 3Di Models & Simulations is installed on its own, disable the "Check Schematisation button", with tooltip: "Please install the 3Di Results Analysis plugin to run the schematisation checker."