Adds a Easter egg speedrun timer for the main quest Easter eggs.

General Changes
Added a EE speedrun timer that activates when the first steps of the main quest Easter eggs are activated and stops when the last steps of the main quest Easter eggs are completed.
Ascension EE Changes
The Casimir Mechanism Easter egg now works with any amount of players.

The buttons step now gives players one hundred seconds to press all four buttons when not in a four player game.

The lunar lander step is solo-able (the LUNA letters are at their original positions in coop) after the pressure plate step (in order: ride the lander near the Revive perk to grab the letter L, ride the lander near the Stamin-Up perk to grab the letter U, ride the lander near the Speed-Cola perk to grab the letter N and ride the lander near the PhD perk to grab the letter A).