Will Rieger

Results 2 issues of Will Rieger

While [this PR](https://github.com/Point72/csp/pull/365) is being worked on, we should change the visibility flag to default. Ref: #365

type: bug
lang: c++
part: build

**Describe the bug** [This PR](https://github.com/Point72/csp/pull/341) introduced hidden visibility for most symbols in the build on non-windows machines. Unfortunately, this hides too many symbols that would be used in external C++...

type: bug
lang: c++