Fixed: Auto-complete definitions not populated

Auto-complete definitions were not being populated for new static
extenders.
Merge pull request #157 from monkey0506/develop-3.3.1

Added user control to edit enum flags (e.g., in a PropertyGrid)
Implemented Do...While

This implements an alternate form of a while loop, do...while. The full
syntax is:
do
{
[loop body
}
while(<condition>);
.gitignore: AGS.Native.dll
Merge pull request #156 from gurok/331_test_build_fixes

Fixed: Auto-complete definitions not populated
Merge pull request #158 from gurok/331_do_while

Do While Loops
An interface for getting a character's destination x/y

This adds Character::DestinationX and Character::DestinationY. Two
read-only properties that can be used to determine where a character is
heading while that character is moving. Returns the character's current
position if the character isn't moving. This seemed sensible to me.
Merge pull request #161 from gurok/bugtracker_get_walk_destination

Bugtracker -- Method to get current Character's destination
Engine: fixed reading threaded audio config option