Fixes to command, open file, enable logging pref

[dimateos]

Hey! Nice work on the updates. I had to do some tweaks so I leave them here in case you are interested:

• "True" "False" booleans in the command were not valid, either use lowercase or cast to interested. Default values were being used instead, there were warnings in the log.
• In my case, decomp.obj was being saved to the blender.exe directory and then get_last_generated_file_path() was not finding it. I just used the same command to set cd beforhand. I picked data_path from preferences, this ensures a global path.
• I added a preference to activate VHACD logging messages.

Thanks

[Maxiriton]

Hey Dimateos,

For some reason I didn't get the notification for you pull request.
Seems great to me, thanks a lot !