Filter out duplicate builds correctly

[lprimak]

Prevents submission of duplicate jobs by comparing them to the ones already submitted.
Fixes the underlying issues while not preventing multiple jobs per action from running

• please use "ignore whitespace" when reviewing *

fixes #27
fixes #32
fixes #49

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[lprimak]

@bluesliverx What do you think?

[bluesliverx]

Sorry @lprimak, finally looked at this. This solution looks great! My only concern that the job instances may not be exactly equal depending on how they are constructed/stored. The worst that can happen here is that we get duplicate triggers for the same job, however, and you should be able to tell if that is happening or not pretty quickly I think.

I'll get this merged and released, thanks for contributing again!

[lprimak]

Thank you! I have been running with this version for a while and haven't seen any duplicate commits.
They used to happen to me all the time, so it should work for most cases :)

[bluesliverx]

This has now been released. Thanks again!