Changelist for version 1.03a

Updated b4-3 so it's easier to get 3 stars
Tweaked m6-3 so it does less damage over time
Added Fixed bomb (part) explosion damage
Added building delete function to Sandbox mode (place object)
Added confirmation to tutorial reset, making it harder to wipe out vehicles by pressing H
Fixed some objects appearing damaged when a map starts
Fixed Description for some parts (cannon, bomb launcher, etc)
Fixed thumbnail not updating for previously saved vehicles