Update bindings to 0.3

[gavv]

Closes #118.

What is NOT covered:

• roc_sender_query, roc_sender_query (will be implemented in 0.4)
• roc_sender_encoder, roc_sender_decoder (created a separate issue: Add bindings for roc_sender_encoder and roc_sender_decoder #122)

[coveralls]

coverage: 93.897% (-1.1%) from 95.037%
when pulling 960f51e on gavv:main
into 69b1a6b on roc-streaming:main.

[coveralls]

coverage: 95.261% (+0.2%) from 95.037%
when pulling 81e8455 on gavv:main
into 69b1a6b on roc-streaming:main.

[gavv]

I've added roc_context_register_encoding

[coveralls]

coverage: 95.429% (+0.4%) from 95.037%
when pulling ead3efb on gavv:main
into 69b1a6b on roc-streaming:main.

[coveralls]

coverage: 95.429% (+0.4%) from 95.037%
when pulling a9c8d22 on gavv:main
into 69b1a6b on roc-streaming:main.

[coveralls]

coverage: 95.429% (+0.4%) from 95.037%
when pulling eb24802 on gavv:main
into 69b1a6b on roc-streaming:main.