[b20b] Shield wall bugs

[Palparepa]

With Shield Wall active, when taking off the shield, or switching weapons to a no-shield configuration, Shield Wall is still active and its bonuses still apply.

Also, when using a Generic Talent point to increase mastery in Weapons and Shield, the Shield Wall increased bonus is not applied, until it's deactivated and reactivated again.

[edge2054]

Both of these are old bugs.

As to the first maybe the weapon switch and wear commands could check for sustains that require a certain type of weapon and then check that their preuse is true. If not then it could deactivate the sustain.