Structure demolition hotkey and other hotkeys

**Is your feature request related to a problem? Please describe.**
We already have hotkeys for important actions, but it could be better if we had hotkeys for minor actions. One such minor action is structure demolition, usually used when you don't want your enemy to get anything. Such a hotkey is required to make fewer clicks per action and save high-value seconds in stressful situations. But players need more hotkeys for better quality of matches. For example, the game still has no hotkey for naval invasion by boat: sometimes you are hustling to take important land and occasionally betray one of your allies.

The issue does not name files or tests. Start by tracing the existing hotkeys for important actions, then determine how structure demolition and naval invasion by boat are triggered. Done means the requested actions have usable hotkeys that reduce clicks without conflicting with existing bindings.

Written by the indexing model from the issue text.