Writing SBOL3 IO

[TimothyStiles]

Is your feature request related to a problem? Please describe.

People keep asking for SBOL3 IO so I thought there should be an issue for it.

Describe the solution you'd like

The SBOL3 parser should implement four functions `ReadSBOL, ParseSBO, BuildSBOL, WriteSBOL.

• ReadSBOL pretty much just does file io and passes a file string to ParseSBOL.

• ParseSBOL picks apart the sbol file string and appropriately fills an AnnotatedSequence instance with it.

• BuildSBOL takes an AnnotatedSequence object and uses it to build a string that can be passed to WriteSBOL.

• WriteSBOL writes an SBOL string to file.

Each function should be tested. The easiest way is to read, and parse an SBOL into a Sequence then build a string with it and write it out then compare the input with the output. If they're the same then you've done it!

[Koeng101]

SBOL3 is probably where it is worth going to. SBOL2 will be going away at some point, might as well focus on the future!