fix issues related to source package imports (golang#507)

Fixes: golang#505
Fixes: golang#515

remove rsc.io/quote/v3 as dep

Revert "Fix golang#71 Do + DoAndReturn signature change error msg (go…

…lang#395)" (golang#413)

This reverts commit f9b4ad1.

don't ignore stdout.Write err (golang#410)

Improve performance of mock generation (golang#397)

Optimizes resolving correct package name with `go list` command. Instead of calling go list for each import in file, now we do it for all imports in one call.

fix not resolving go module major versions (golang#385)

This change now makes use of go list to check for package names. This
tool is module aware and allows for better named imports.

To test this change I needed to also add a small package to our mod
file. To keep this import from disappearing from go.mod I made use
of the tools file strategy.

Note this change will change the import names in generated code. This
should not be a breaking change in user code.

Fixes golang#326

ci: adds check to ensure go modules are up to date

Tidy up module dependencies

gomock: refactor directory name

Rename directory to match default package output of gomock.

mockgen: use Controller.Helper() in generated mocks

Using T.Helper() better directs the callstack to point at the
offending line in the production code.

fixes golang#239