ZMQ wrapper - add Windows/Mac native libs and loading logic

[aion-kelvin]

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Description

Please include a brief summary of the change that this pull request proposes. Include any relevant motivation and context. List any dependencies required for this change.

• Recently, changes were made to 3rdParty/libnzmq so that it performs the work of loading native libraries. It was previously scattered about in the kernel.
• The new native loading logic is hardcoded for Linux. This PR adds support for Mac and Windows.

Fixes Issue # .

Type of change

Insert x into the following checkboxes to confirm (eg. [x]):

• Bug fix.
• New feature.
• Enhancement.
• Unit test.
• Breaking change (a fix or feature that causes existing functionality to not work as expected).
• Requires documentation update.

Testing

Please describe the tests you used to validate this pull request. Provide any relevant details for test configurations as well as any instructions to reproduce these results.

• Testing involved followed this template:
  • build the Maven jar for 3rdParty/libnzmq with this new code
  • bundle that jar into a version of aion_api that uses an updated version of kernel dependencies (versions that don't do the ZMQ native lib loading logic that they used to be responsible for) and build a new aion_api jar, which is a fat jar containing all its dependencies
  • Run the Aion Desktop Wallet using the new aion_api jar, for each platform
• Testing for each platform was different because I wanted to avoid having to build the Mac and Windows installers
  • For Linux: build Desktop Wallet as usual, but with the updated aion_api Jar, and with the old ZMQ Native loading logic removed. Start Wallet and see that it connects to Nodesmith and can get peers and sync info.
  • For Win/Mac: to avoid building their installers, download the latest release of Wallet and install it. Then go into the installed location -- the native libs are in that folder as part of the installer process. Delete them all to prove that the old Native loading logic is not being relied upon; start up the Wallet and see that it fails to connect to Nodesmith. Then replace the aion_api jar with the new one we built and see that it succeeds at connecting to Nodesmith.

Verification

Insert x into the following checkboxes to confirm (eg. [x]):

• I have self-reviewed my own code and conformed to the style guidelines of this project.
• New and existing tests pass locally with my changes.
• I have added tests for my fix or feature.
• I have made appropriate changes to the corresponding documentation.
• My code generates no new warnings.
• Any dependent changes have been made.

[arajasek]

Thanks for this! Changes look good, so I've approved.

I haven't manually tested yet, will do that this weekend just to double-check.