Removes the 'activeMCVs' list since it was not useful.
The real bugfix is not iterating over 'activeMCVs' when issueing new orders
(this was previously needed for already discovered mcvs that stopped)
but over 'newMCVs' instead.
Fix MCV Manager glitch when restrict building area is enabled. It was checking if the location was close enough to the Base center instead of using the MCV Managers min and max ranges. This would cause it to often have no valid locations despite having a huge range.
