Make a default icon when an ability isn't found

[xiuda]

Right now the game crashes if an ability's icon isn't present. I think we could make something that acts like our default icon.

Proposed Solution

• Create an icon for an unknown ability [Asset: @Phanterm ]
• Make it the default for all abilities unless another icon is set [Code: @xiuda]

[xiuda]

Or the long term solution is to just make all of the ability icons now so we have the asset immediately when new ones are made.