Thing types

Doom, Doom II, Final Doom
These tables include the following columns:
 * Decimal - Type number, in decimal
 * Hex - Type number, in hexadecimal
 * Version - First Doom version that thing appears in:
 * S - Shareware
 * R - Registered
 * 2 - Doom II
 * Radius - Radius, in map units
 * Sprite - First four letters of the name of all sprite graphics
 * Sequence - For animations, sequence used for fifth letter of sprite name
 * Class
 * I - Item: Counts toward ITEMS percentage at level end
 * P - Pickup: Player can pick the thing up by walking over it
 * W - Weapon
 * M - Monster
 * O - Obstacle: Players and monsters must walk around
 * ^ - Hangs from ceiling, or floats if a monster
 * Description