Imply all types of specific gameplay mechanics parody into the main "gameplay mechanics" tag

BUR #34927 is pending approval.

create implication breast_slider -> gameplay_mechanics
create implication button_prompt -> gameplay_mechanics
create implication character_select -> gameplay_mechanics
create implication command_input -> gameplay_mechanics
create implication dialogue_box -> gameplay_mechanics
create implication dialogue_options -> gameplay_mechanics
create implication equipment_screen -> gameplay_mechanics
create implication gacha_(game_mechanic) -> gameplay_mechanics
create implication loot_box -> gameplay_mechanics
create implication health_bar -> gameplay_mechanics
create implication nudity_debuff -> gameplay_mechanics
create implication quick_time_event -> gameplay_mechanics

These are the obvious types of gameplay mechanics tagged on the site, and therefore it should be implied to the main tag. I've omitted the less obvious ones like heads-up display since this also appeared in other non-gaming stuff.

Not all of these are game-specific - "press any key to continue", for example, is a button prompt that is arguably more prominent outside of games. Also, not all of these are mechanics - dialogue boxes are essentially just a variation on a speech bubble; they usually don't do anything in a game.

At the end of the day, gameplay_mechanics is for when a post references how a game works, rather than something that's just in the game. A post with a loot box in the corner has nothing to do with a gameplay mechanic, but a post showing a character faceplanting after being thrown from an opening loot box is referencing how that loot box works in-game.