Fixes/improvements

[#3769] Add default user agent configuration option; change OpenComputers' default user agent to "opencomputers/$version".
[#3759] Add V1 and V2 to the robot name list. (AutumnalModding)
[#3727] Fix more regressions related to OpenOS error handling. (jasonS05, kcinnajlol)
Fix client-side memory leak on anything RedstoneAware (Glease)

List of contributors

asie, AutumnalModding, Glease, jasonS05, kcinnajlol