Remove unused avoid_staging_area global variable

This CL removes the declaration of the variable `avoid_staging_areas`
from route_planning, and removes the call to set this from full_demo.
Note no other scripts refer to this variable, and current route planning
logic does not use it.

Bug: #45, #39
Test: Passes all tests
Test Summary:          | Pass  Total     Time
ConstructionBots Tests |   15     15  3m48.2s
     Testing ConstructionBots tests passed

src/full_demo.jl

@@ -558,7 +558,6 @@ function run_lego_demo(;
             save_animation!(visualizer, "$(anim_prog_path)preprocessing.html")
         end
     end
-    set_avoid_staging_areas!(true)
 
     execution_start_time = time()
     status, time_steps = run_simulation!(env, factory_vis, anim, sim_params)

src/route_planning.jl

@@ -13,9 +13,7 @@ export
 
 export
     set_use_deconfliction,
-    use_rvo,
-    avoid_staging_areas,
-    set_avoid_staging_areas!
+    use_rvo
 
 function set_use_deconfliction(deconflict_strategies)
     if in(:RVO, deconflict_strategies)
@@ -34,11 +32,6 @@ end
 global USE_RVO = true
 use_rvo() = USE_RVO
 
-global AVOID_STAGING_AREAS = false
-avoid_staging_areas() = AVOID_STAGING_AREAS
-function set_avoid_staging_areas!(val)
-    global AVOID_STAGING_AREAS = val
-end
 global STAGING_BUFFER_RADIUS = 0.0
 staging_buffer_radius() = STAGING_BUFFER_RADIUS
 function set_staging_buffer_radius!(val)