Merge pull request #17 from mshafer1/dev/toast_notifications_plus

focus the close button before first launch and on every show to make title text consistently not selected

apply suggestions

add support for still playing the Windows alert sound

Make the blue a little closer to the true default

apply Rider suggestions

use an enum

massage the colors a little more

change default of new notifications to light mode

use seconds for value of timeout rather then mS

use 0 for "don't timeout" and don't allow -1

remove unused imports

introduce theme files and handle in notification popup

fix button hover behavior

rename elements in new dialogue to PerlCase per PR comment