Add ignore regions to object detector

[Pbatch]

Problem statement

Various regions of the image are getting unit detections when they shouldn't be

Simple Solution

Crop the image to remove the decoration at the sides.

Advanced Solution

Create an ignore region that includes:

• The edge of the image
• The princess towers (when they have >0 HP)
• The king tower

Throw away unit bboxes which have 50% of their area inside an ignore region.