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This adds a new "Model Variables" dock panel to the model editor, allowing users to create and set custom expression variables for use in the model. These variables are available anywhere expressions are (correctly) evaluated within the model, so can be used as input parameter values for child algorithms, within data-defined dynamic parameters, etc. The use case here is for models which use a constant value throughout multiple steps within the model (e.g. @target_resolution: a target raster resolution, @max_simplification: a simplification value for input features coming from different sources, etc), allowing users one single place to define and edit these constant values (instead of hunting down and setting them in multiple places throughout the model). These variables are stored within the model itself, and are not exposed outside of the model designer dialog.