Revert "utils: use slice as chan buffer"

This reverts commit f6f4a65ae6ed72ff87fa6c8f67ac319333ec7c55.
Revert "session: remove unused code"

This reverts commit 65f3761324830b3a0f659e740171f20df3001f64.
Revert "session: use slice as packet buffer"

This reverts commit 896267191abb39370d893be8e3cda5a45cc7a33a.
windows: update bin