Removed cl_port as it's for very rare corner cases
Removed cl_movement as nobody should disable it, but sometimes people
did by accident or without understanding the effect,
also https://gitlab.com/xonotic/xonotic-data.pk3dir/-/issues/2549
Added cl_netrepeatinput as this compensation has a cost and hides issues
Modernised speed limit options (should not imply xonotic supports 56k)
Removed 30fps from cl_maxfps options
Added 40fps cl_minfps option, fixes "Custom" being displayed by default