Add a config option to the BepInEx Plugin so in development features can be disabled

Features that are in development shouldn't appear unintentionally but should still be accessible to developers.
To achieve this an option should be added to the plugin, something like a devmode.
When this option is enabled and the game is restarted the mod should now show options that would otherwise be hidden.

Currently the only place where this should be used is the MAKE MANNEQUIN menu option in Menus/Practice/PractiveMenu.

Important note for people passing by this issue

It's important that enabling devmode should never give the player running the mod an unfair advantage.
If a feature is implemented that would give the player an unfair advantage (like enabling running) this should always be shown on the screen in some way (like with the EventDisplay system) so that speedrun verifiers can see that unfair features are being used.

Start by locating the BepInEx plugin configuration and reading Menus/Practice/PractiveMenu, especially the MAKE MANNEQUIN option. Add a development-mode setting that takes effect after a game restart and controls visibility of that option. Done means the option stays hidden by default, appears when devmode is enabled, and any unfair future features remain visibly identified.