Added custom map sizes

Added the option for the host of a lobby to change the size of the map. This will allow newer players the chance to learn puzzles/game mechanics in a much smaller environment before delving into the full-scale manor.

Since the large map is technically still the main game, most achievements are disabled for small and medium map sizes. Only 'Mastermind' and 'Runaway' will still be obtainable. This is only temporary as I do plan to add more achievements in the future.

The number of zombies and resources will also change depending on the size of the map:

Small Map

• 1 Floor (Around 40 rooms)
• 30 Enemies (1 special enemy type)
• 3 Ammo boxes per weapon
• 4 Puzzles

Medium Map

• 2 Floors (Around 65 rooms)
• 40 Enemies (2 special enemy types)
• 4 Ammo boxes per weapon
• 8 Puzzles

Large Map

• 3 Floors (Around 80 rooms)
• 50 Enemies (3 special enemy types)
• 5 Ammo boxes per weapon
• 12 puzzles

I also added an objective bar to the inventory screen that shows which escape route has spawned and the player's progress toward accessing it.

I'll be working on implementing a discard system, as well as a few other additions that were suggested. If you have any feedback always be sure to let me know in the Steam Discussions board, thanks!