Vyper improvement patches.

[joeizang]

address #4537 issues including:

• spinner for compile button like in Sol plugin
• Fix badge behaviour to match solidity compiler

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[ryestew]

The badge update is for the icon panel right? But I don't see any change there - although it does look fine. The spinner change is fine.

[ryestew]

The change in this PR is awareness of when a different file is selected than the one that was compiled, it resets the compilation state.
The next change might be to enhance handling the state of vyper compilation sessions, basically bringing more of that state to the ide itself and not rely on the docker container after it sends a compile result.

[ryestew]

OK - this PR works - but it is leaving out 1 thing:
When switching between vyper files - if 1 has a compiler error and you switch to another file, the error badge on the icons panel doesn't clear - so the uncompiled file shows the error. A successful compilation will clear this error - but it should be removed when another file has the focus.

[joeizang]

or. A successful compilation will clear this error - but it should be removed when another file has the focus.

Ok. Can we merge this PR so I make any other changes in another PR?