Avoid having implicit imports.

[jd-foster]

Changes using to import explicit formula ofusing Package: Package for dependent packages.
Possibly addresses #22

[BeastyBlacksmith]

I'm more in favor of using using JSON: JSON and similar and only using import when something is getting extended.

However I'd be surprised, if it fixes #22

[jecs]

May I ask why CI tests Julia 1.6? I believe that 1.10 is the new LTS version.

I wonder if the failing CI is related at all to #22.

[jd-foster]

Even without issue 22, I think the Julia community is heading towards this style anyway.

[BeastyBlacksmith]

To clarify: both using JSON: JSON and import JSON only bring JSON into namespace. The only difference is that import allows methods from JSON being extended without qualification while using JSON: JSON does not (AFAIK).

[jd-foster]

Right, from here: https://docs.julialang.org/en/v1/manual/modules/#using-and-import-with-specific-identifiers,-and-adding-methods

[jd-foster]

Changed to the using X: X form for Base64 and Kaleido_jll