Add descriptions to action commands

[AndreMoukarzel]

As an example, BonusDmg requires the player to press the action button with correct timing for extra damage, or the "other" button with even more precise timing for huge damage. This explanation should be available to the player in one or more of the following moments:

• Selecting the action
• Walking up to the target to execute the action
• Acting the action

[AndreMoukarzel]

Maybe it would be better for the description to be by action, this way its possible to be more specific with each description