[z2097] Move opvpmgr based capture point saving / loading to opvp class

Also improve capture point locking code and fix saving lock state in NA and GH

Note: Keep in mind that capture points won't be activated before you call SetCapturePointSlider() function

(based on commit [12141] - 9a80d01)

(based on commit [s1716] - dd7c860)
[z2098] Fix possible memory leaks in Outdoor PvP

(based on commit [12142] - 62ec9ad)

(based on commit [s1717] - 05c4894)