Fix #349 : batch exportation of pokemon models

[lobster6]

Pokemon files in Pokemon Sword and Shield were not impacted by Batch Export because GFBMDL did not inherit IExportableModel, so the program considered that there was nothing to export. I did not try for Animal Crossing or Pokemon Let's Go, but the solution may be similar, depending on what file format you want

There is a bit of repetition with the ExportModel function, maybe we can simplify it though :

Switch-Toolbox/File_Format_Library/FileFormats/Pokemon/GFLX/GFBMDL/GFBMDL.cs

Line 744 in 849aa7f

public void ExportModel(string fileName, DAE.ExportSettings settings)

[hYdos]

There seems to be an issue with this code or the existing code where exported models have their texture uv's messed up