Keyboard shortcuts for menu actions

[Avasam]

MacOS automatically picked up the about and settings windows (probably thanks to Qt). This reminds me we should probably have canonical keyboard shortcuts for the following menu actions:

• View Help (F1)
• Save Profile (CTRL-S)
• Save Profiles As... (CTRL-SHIFT-S)
• Load profile (CTRL-O)
• Settings (CTRL-,)

And we need to ensure they won't interfere with hotkeys.