Axis aligned camera POV

I recently used arviz-godot to take screenshots, but I really struggled to get a good camera position (Top view in my case). As arviz-godot has screenshot and video recording tools, it could be great to be able to position the camera along an axis to get a cleaner view.

• num5: switch orthographic / perspective - change pov
• num1: place camera on y-axis and switch between y and -y
• num3: place camera on x-axis and switch between x and -x
• num7: place camera on z-axis and switch between z and -z
• num4 and num6: rotate camera on camera plane left / right 15 degrees
• num2 and num8: rotate camera on orthogonal camera plane up / down 15 degrees
• make coordinate system in bottom right interactable
• add "gravity" option to camera
• add equivalent playful functionality
• check playful reset camera
• include new hotkeys in view menu
• add tool tips -> moved to !106 (merged)
• add continuous rotation when button is pressed down
• add new hotkeys to help menu
• In orthographic + playful: Let W+S move "up" and "down" in image plane
• In orthographic + technical: Use mousewheel to change image size (to emulate "zoom")
• Rotating the view (4, 6, 2, 8): Snap when pressed with Shift, continuously without
• implement orientation indicator double click functionality to switch axis sign
• fix orientation indicator rotation along all planes
• fix dark outline of orientation indicator
• Add option to move camera forwards/backwards in orthographic mode -> moved to !210