[Management] Plugin dependencies

[sfarrens]

@AGrigis how would you like to manage plugin dependencies?

a) Centralised: Plugin developers open an issue and/or PR to update the core PySAP dependencies in info.py. I think this is the safer option as we can control the versions used, but it requires a bit of overhead.

b) Decentralised: Plugin developers manage their own dependencies separately. This minimises the overhead but may create issues with regards to 3rd-party package versions. e.g. if plugins use different versions of the same package.

[sfarrens]

@AGrigis can you let me know if you have any thoughts on this issue?