CGE2: Missing keymapper bindings

[ccawley2011]

The CGE2 engine has a custom keymap, but not any default bindings for joysticks. It also doesn’t have actions for the mouse buttons, making the game unplayable with a controller.

[bluegr]

This isn't a blocker, as the game didn't have custom keymaps in the past, to make it playable with a controller. Appropriate keymaps for the joystick should be added, indeed.

Lowering priority

[ccawley2011]

Before the custom keymaps were added, the CGE2 used the default engine keymap, which has bindings for the mouse buttons and allowed it to be played with a controller. The new engine keymap takes the place of the old one, and since it's missing mouse bindings it's completely unplayable with a controller. Since several supported platforms use controllers as the primary input method, this is what made the issue a blocker.

[Filippos Karapetis <bluegr@…>]

In a57900d8:

CGE2: Rewrite keymapper and add joystick support - bug 15188

Also, clean up the keyboard input code. The two quit actions
have been merged into one, as the second one was superfluous

[bluegr]

Fixed with the following commit:
​https://github.com/scummvm/scummvm/pull/6021/commits/70bb7e5b5ce26ad1c4c07c011962197c1812af99