[#13] Implement generation of bgeo directly in Houdini.
[#13] Improve presenting information to user and support forced generation.
[#13] Update OTL with button to generate bgeo.
[#13] Add better error for when user has not loaded package before bgeo generation.
[#13] Fix variable reference error.
Merge pull request #22 from 4degrees/13_generate_bgeo_in_houdini

Fix #13: Generate bgeo in houdini