ENH: ParticleHistogram: refactor PatchParticleHistogram function object

- enable 'faceZone' support.
- introduce 'cloudFunctionObjectTools' to simplify collection of particle info
  on patches or face zones.
- enable 'writeFile' support to better control file output.
- rename 'PatchParticleHistogram' as 'ParticleHistogram' for better clarity.

tutorials/lagrangian/reactingParcelFoam/airRecirculationRoom/transient/constant/reactingCloud1Properties

@@ -531,7 +531,7 @@ in the injection models set above we have
 36  μm ->  2 parcels per second
 45  μm ->  2 parcels per second
 
-therefore in the following "patchParticleHistogram1" we can set
+therefore in the following "particleHistogram1" we can set
     nBins = 9
     min = 0μm
     max = 45μm
@@ -547,9 +547,9 @@ in this ways the particles hitting the patches will be classified in the followi
     9) 40.01μm to 45.01μm <- the 45μm particles will be counted in this range
 */
 
-    patchParticleHistogram1
+    particleHistogram1
     {
-        type            patchParticleHistogram;
+        type            particleHistogram;
         patches
         (
             roof

tutorials/lagrangian/reactingParcelFoam/filter/constant/reactingCloud1Properties

@@ -167,9 +167,9 @@ cloudFunctions
         writer          vtk;
     }
 
-    patchParticleHistogram1
+    particleHistogram1
     {
-        type            patchParticleHistogram;
+        type            particleHistogram;
         patches
         (
             cycLeft_half0