Improved menu keyboard navigation

[SuuperW]

Several bug fixes.

New behavior existing in master and this PR but not in 2.10, arguably a bug:

• Pressing Alt+F does not work when F is bound to a controller input. You can at least in this PR use Alt, then F.

Bugs that exist in 2.10 and master, fixed in this PR:

• Pressing space while the tool strip menu is focused does not work. (Main form only)
• Alt does not properly focus the menu. (Main form only in 2.10, main form + TAStudio in master)
• Pressing a hotkey while the main menu was open activated the hotkey. (Main form only) (the system menu [alt+space] still has this issue)

Regression from 2.10 in master, fixed in this PR:

• Pressing Alt combinations did not work in input-blocking tools.

Bug existing in all three:

• Alt+Space -> Escape leaves the program is suspended as if menu selected, but pressing a menu key does not open a menu and instead resumes the main program loop. (All forms)
• Pressing context menu key in TAStudio does not work.

Check if completed:

• I have run any relevant test suites
• I, the commit author, have read the licensing terms for contributors (last updated 2024-06-22) and am compliant