[Feature Request] OBO parser improvements

[HLWeil]

Is your feature request related to a problem? Please describe. I have a task where I need to create OBO terms programmatically and then write them out into an OBO file. Currently, the OBO parser only has reading but no writing capabilitites. Also the functions for creating OBO terms are really unpractical to use, as they have a lot of parameters, which could be optional.

Describe the solution you'd like

• Add OBO writer
• Either make parameters in OBO term creation functions optional or add some easy to use functions