MGR: When erasing controls in Simple Preferences dialog, align background image correctly for controls that are descendants of the dialog deeper than one level (grandchild, great-grandchild, etc.)

VBOX: If polling for the current VM state fails for any reason, like vboxsvc crashing, do a temp exit for 24 hours.

Before COM, polling for the current state wasn't as critical.  If the poll operation failed, we would try again in one second anyway.

After COM, it is used as a test to see if the communication channel between the wrapper and VirtualBox is still operational.  If not, temp exit and hope things work the next attempt.

MGR: Fix appearance of Simple Preferences dialog items when tabbing through the items to change focus; adjust length of static line for DPI setting on Windows.

MGR: Fixes for correctly displaying controls over a background image in Simple Preferences; adjust size of warning symbol bitmap for dpi setting on Windows for Simple and Advanced Preferences.