ACCURACY: Adds an accuracy counter to the scoreboard

[kai-li-wop]

The goal is to add an accuracy counter to the scoreboard, as it has been requested by the community. Instead of showing the counter to all players by adding it to the scores, I think it is good enough to only show it locally to the client itself to avoid too much bashing of new and not so experienced players.

• [x] need a header texture: Accuracy
• [x] needs to show score->accuracy as a percentage, so add a %.
• [x] do not track shots and hits for Punchy, Spraypistol and Grapplehook

Weapons where the accuracy count seems to work as expected:

• [x] NiPPER: works fine, the count is correct
• [x] BALLONY: looks good, direct and indirect hits are taken into account
• [x] BETTY: looks good, direct and indirect hits are taken into account
• [x] BUBBLE G: works fine, the count is correct
• [x] SPLASHER: works fine, the count is correct
• [x] iNjECTOR: works fine, the count is correct
• [x] PUMPER: count should be correct after changes
• [x] BOASTER: count should be correct after changes
• [x] iMPERiUS: count should be correct after changes

[mgerhardy]

what about G_RunExplosion - should this also count into the accuracy calculation?

[mgerhardy]

should work now

[kai-li-wop]

@mgerhardy: I merged the pull request but there is one thing that might need a fix. Imperius shots are somehow count double. I always receive 200% when shooting one other player with one Imperius shot.