Windows Jenkins configuration script assumes some dependencies present on server

[Be-ing]

The Jenkins configuration scripts assume that the ASIO SDK and MSVC Redistributable are present on the build runner and assume specific filenames. This setup requires write access to the build runner's storage to update those dependencies. Instead, those should be downloaded by the build scripts if they are not already cached in the Jenkins workspace like how the macOS scripts work.

[Be-ing]

This is pretty much the same issue as #59 but explained differently. Sorry for the noise.