[TF2] Update tf_bots to support newer flag types

[MasterOfRespawn]

Description

This adds all currently implemented flag types to CTFBot::GetFlagToFetch so tf_bots will try to capture these flag types.
This also updates CTFBot::GetFlagCaptureZone to ignore disabled capture zones and return neutral capture zones.
This makes the tf_bots functional on sd_doomsday and should allow them to play all player destruction maps with a capture zone inside the normal area.

[TheBetaM]

The check for disabled capture zones is not sufficient for all maps (like pd_snowville_event).
Some maps way of disabling the triggers changes CBaseTrigger::m_bDisabled but not CCaptureZone::m_bDisabled, causing the check to pass for those disabled zones.