Alpha 5 patch 9 hotfix 7

Added/changed:

• Lots of small optimizations (around 10-20% performance boost)
• Added an option to disable supply source problems notification

Fixed:

• Incorrect family tree items in some cases of marrying a widow/widower
• Wrongful notification related to supply source list (when set to 0)
• Trade deal window didn't return to previous pause state on close
• Crash on bridge demolish in some cases
• Cancelling vehicle orders messed up the game and led to crashes
• Potentially fixed one of the causes for random crashes