[FEATURE] Content Dev Mode

[NodokaHanamura]

Feature Description
A mode that allows for content creators for aircraft, scenery, and the sort to have deeper control over the simulation and software to allow YSFlight to do the following:

• Show debug information regarding aircraft, ground objects (selectable to avoid clutter), scenery, weapons, sounds and the sort.
• Allow the user to press a keybind combination to reload the current selected (in menu) or active (ingame) aircraft's DAT and Models.

Any other suggestions for this mode is welcomed.

Why is this feature important?
As a modder for various games in the past, the importance of being able to test your work live is paramount - it streamlines the workflow, it minimizes time spent reloading the entire game and going through menus to retest things, and allows for quicker debugging of issues.