This changes the flag and resize icon properties on the region comment

block view from private to public. Eventually when Power Pack drops

support for RB5 and 6, we'll need to be able to access these variables

via a child class of the region comment block view, which we can't do

if they're private.
This isn't a blocker for Power Pack 6. Since that needs to support

RB5 and 6, we override the flag and resize icon properties there

to suit our needs. Once Power Pack is on RB7+, we'll want to

inherit and use these public properties instead.

Ran JS unit tests.
Smoked tested region comments on an image.