Add dependency and mod compass block

[Zaechus]

I added SWIG as a listed dependency and modified the compass block to allow for more than one input resulting in multiple needles.

[tfcollins]

Is there a reason behind requiring that version of SWIG, plus I think SWIG is already a dependency of GNU-Radio?

[Zaechus]

I am not sure the version matters, but after installation, I was required to install SWIG even though I already had GNU Radio.

[tfcollins]

@maxgy

We are looking at this, but people are traveling and/or on vacation. So it may take a week or two to get you some feedback.

[tfcollins]

@neelpandeya Let me know when you have some time to discuss :)

[salvador2186]

for gnuradio 3.9 or 3.10 pls

[michaelld]

for gnuradio 3.9 or 3.10 pls

We are working on this ... will hopefully have these in place by early September for GRCon'23