[12577] Add positive exception for spell 56099
[12578] Implement spell effect 45625
[12579] Change startup logo. Thank to all involved.
[12580] Improve chat channel code:

- Remove unnecessary calls to GetPlayer
- Invert "if" statements to reduce nesting
- Cleanup code

Signed-off-by: stfx <stfx@hotmail.de>
[12581] Implement 2 chat channel responses

- CHAT_PLAYER_NOT_BANNED_NOTICE
- CHAT_PLAYER_INVITE_BANNED_NOTICE

Signed-off-by: stfx <stfx@hotmail.de>
[12582] Fix reloading horde controlled capture point

Negative value of 0 (CAPTURE_SLIDER_HORDE) is still 0

Part of cmangos/issues#53