Validity vector, function inline, cleanup, etc.

-Added validity deque which holds information whether the n'th frame is
valid or not (invalid if lost_track==true during the frame)
-Inlined many functions. Probably doesn't do anything as compiler
inlines short getters and setters (mutators and accessors) itself, but
this should make it more clear
-Added overloaded version of draw_plan_view, so its possible to draw it
without detection_module
-Changed draw_plan_view functions to get rid of hardcoded values. Now
width/height is taken from output image and vertical lines (showing
search region) are now calculated to show correctly
-Added getBinSearchWidth() function to return the search region width
value