Add configuration option for ghost reset distance. Improve documentation.

vertexshader.glsl

@@ -1,4 +1,5 @@
 #version 460 core
+// Basic vertex shader for world geometry (walls/floor). Transforms positions/normals into view space.
 layout (location = 0) in vec3 aPos;
 layout (location = 1) in vec3 aNormal;