#1 Bot improvements

- Bots will choose a random Bomb Site / Escape Zone / VIP Safety Zone. - T-bots: fetch bomb backpack when it has been droppen. - T-bots: plant the bomb. - T-bots: roam the planted bomb. - CT-bots: random buy defusal kit. - CT-bots: defuse bomb. - CT-bots: roam the defuser. - Small waypoint adjustments for `de_dust2` which enables bots to successfully jump on the big boxes to B, and they jump more easy over the ridge from T spawn to B.