Improve User Account Control flags for AD

[adeutscher]

Kicking myself now, but I've now learned how flags are properly stored at the bit level.

The main flags-like variable in DirectoryTools is for the Active Directory User Account Control property.

Things to review/add:

• Implement a better way of describing a UAC flag, preferably in a way that indicates the power of 2 that makes up the value.
• Revamp the method to set a flag to reflect the new storage method.
• Implement a method to check if a certain flag is enabled (knowing the power of 2 used in the value will be very useful here)
• Implement a method to disable a flag.

[adeutscher]

Added actual use of bitmasking in a73ae8e . In hindsight, making an entire class for this was a bit overkill, but the new method is leaps and bounds better than the old one.