Keybinds Listing

As I recently came up with an issue, that a keybind worked around to solve.

Suggestion is to simply have a section under the 'help' category that lists all the functional keybinds of Dungeon Alchemist.

I never would've known to use Alt+Enter to leave fullscreen mode without going to the discord, which added an extra layer of frustration to an already drawn out issue.

Having this listing would give users more of an idea of what things they could do beyond the standard functions we can find just by looking at file/edit/view and give more resources to try to attempt to fix something themselves before having to resort to going to the support forum on the discord.