Add configuration option for ghost reset distance. Improve documentation.

text.h

@@ -7,6 +7,7 @@
 #include <ft2build.h>
 #include FT_FREETYPE_H
 
+// Loads glyphs and configures OpenGL state to render HUD text via Freetype.
 int init_text(int *shader);
 void render_text(int shader, std::string text, float x, float y, float scale, glm::vec3 color);