added some code to handle resizing better, and fact OnSize can't be relied upon to be called for bit map allocation
added some code to handle resizing better, and fact OnSize can't be relied upon to be called for bit map allocation

git-svn-id: 31cbfd89c62d6b8b302bb3be5c74ebef9d32ffd0@797 01035d8c-6547-0410-b346-abe4f91aad63

tmiw/freedv-osx,tmiw/freedv-osx,tmiw/freedv-osx