flag events as hud message

[sauerbraten]

• steals, pick-ups, drops, returns, resets, scores (filter var)
• similar to frags, using for example " reset" or "p1x stole"

[sauerbraten]

I haven't found a good way to render these events... the best I can come up with is

• steal: 🚩 p1x
• pick up: 🚩 p1x
• drop: 🚩 p1x
• return: 🚩 p1x
• reset: 🚩

but that breaks down when someone scored, i.e. touches both flags. should it just be "score: 🚩 p1x"? assuming it's a score for your team, should it show the red flag icon, which would be consistent with the flag the player stole/picked up before that? or should it be the blue flag icon, since the player scores for "team blue"?