Various Fixes

[kolbyb]

• Fixed some of the perspective issues

  Adjusted the Camera FOV from 180 degrees to 60

  Added a planar approximation by calculating the distance from a Ray's impact point to the Camera's forward Plane. This will compensate for the fish eye effect and works much better at lower FOV.

• Fixed Forward/Backward/Left/Right movement.

  These now update based on the elapsed frame time.

• Added a 2d Map Display primarily for debugging purposes

  This is currently on by default, but can be adjusted on line 518.

• Added Debug Options

  Press M to toggle the 2d Map Display Press P to toggle the planar approximation Press C to toggle an alternate coloring mode based on surface normals Press R to toggle Rays being drawn on the 2d map

• Introduced the concept of Segment (surface) Normals

  This produces a Forward normal, however given the current map generation this will result in many Wall Segments being considered "back-facing". It's possible to deduce this in other ways, but this seemed simplest for now.