Examples updated to match MTK v9 macros syntax

[matthew-kapp]

The examples have been updated in such a way that the exact same model is created, but the syntax matches that used by MTK v9, where @mtkmodel and other macros are used.

1. electrical.jl is updated with electrical.svg generated. For some reason, the capacitor is skew though.
2. mechanical.jl is updated with mechanical.svg generated.
3. hydraulic.jl was not updated, as components within @mtkmodel expect (; name) as the firs argument. Tube in standard library is not set up this way.

[matthew-kapp]

@bradcarman Just following up here?

[bradcarman]

Yeah, I think this looks good. Can you just remove Revise from the Project.toml? I don't think it needs to be there.

[matthew-kapp]

@bradcarman Done

[matthew-kapp]

@bradcarman Just following up here?

[bradcarman]

Hi @matthew-kapp this looks good, I'll approve. Thanks for your contribution!

[bradcarman]

All looks good

[matthew-kapp]

@bradcarman sorry, I'm still learning git approvals - is there still a final step to merge merge request?

[bradcarman]

Sorry, I was just waiting for tests to pass, all merged now.