[2020] WvW and new commander markers

Short and on topic:

1. With new markers you can target anyone you see for as long as you desire (the commander desires). That person dying or running far away or using stealth does not matter - your mark is visible again the moment you exit stealth, unlike the old Ctrl+T one. You are still marked. Forever... well, until you leave map.

2. While it looks fun this might lead to some issues, such as permanent sniping of certain player by a large group. If that player is the enemy commander his life will be a mess for looong time.

3. If the marker can disappear after your target goes into stealth, moves long distance away, 10.000/20.000 units for example, or just dies then it will be back to old hard mode sniping, while still keeping the new markers useful.

edit: Fixed an issue that could prevent object markers from being properly removed when the object leaves the visibility of all squad members.