Update book font resolution after window size change
We scale journal/book UI layer with its text to the window size, so font texture resolution needs to be different after every window size change. A brute-force solution would be to replace book font after every size change, but old fonts still can not be in use, so MyGUI keeps them for the whole application session. Basically, it is kind of memory leak.
Maybe there are better options (e.g. to create font texture on our size and pass it to MyGUI rather than replace the whole font).