Restore some more HL2-specific gamerules behaviors
sk_plr_health_drop_time
sk_plr_grenade_drop_time
sv_robust_explosions
Entities that block radius damage, don't block it on themselves
Do not hide servers with OOB data, clamp the data
Do not hide the server from master server if sv_lan is 1
This causes LAN servers to be invisible to the LAN tab in the server browser, which is a regression.
Mention `hide_server` convar in sv_lan's description.
Fixed a Linux crash with sv_showlagcompensation (hopefully, most likely)