Updates dependencies; applies fixes per github code scan results

Adds workaround to make HSTS middleware work

Adds HSTS

Removes problematic log message; makes max poll count configurable

Changes name to github.com/arm-doe/sts

Bumps go version; tweaks ms build script

Fixes race conditions; adds some [mostly debugging] features

Bug fixes; improvements to controlled mode

Removes automatic directory pruning

Fixes at least one cause for potential stage deadlock