2.4.0 - Upgrade minizip to minizip-ng 3.0.2

[jhudsonWA]

New name, also updated readme's to point to new location for this project.

[jhudsonWA]

@Coeur minizip name changed since our last upgrade. They also are now at 3.x based releases. As far as I can tell the main functionality seems the same. This PR updates readme's and such to match the new location.

Also, just for you, following the Release Instructions results in flags that want you to switch to libcomp instead of zlib, at least when I did it. [I added notes to the master copy of this file to ignore those flags and files for now and stick with zlib]

Following this switch would require a bump to our supported platforms (at least mac os 10.11+). I'm ok with that, but that type of change should be a 3.x change for us as that would be breaking for older versions, so for now I kept the flags to be zlib and all tests pass for this upgrade.

Please give it a review.

[jhudsonWA]

bumping version to 2.4.0 as we will have other changes in this release (no breaking) and with the major version upgrade in minizip. Feels more than just a 2.3.x point release.