sampling: Renamed and moved classes from fileFormats

The writer class has been renamed setWriter in order to clarify its
usage. The coordSet and setWriter classes have been moved into the
sampling library, as this fits their usage.

applications/utilities/postProcessing/lagrangian/particleTracks/Make/options

@@ -2,11 +2,13 @@ EXE_INC = \
     -I$(LIB_SRC)/finiteVolume/lnInclude \
     -I$(LIB_SRC)/meshTools/lnInclude \
     -I$(LIB_SRC)/fileFormats/lnInclude \
+    -I$(LIB_SRC)/sampling/lnInclude \
     -I$(LIB_SRC)/lagrangian/basic/lnInclude
 
 EXE_LIBS = \
     -lfiniteVolume \
     -lmeshTools \
     -lfileFormats \
+    -lsampling \
     -lgenericPatchFields \
     -llagrangian

applications/utilities/postProcessing/lagrangian/particleTracks/particleTracks.C

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     | Website:  https://openfoam.org
-    \\  /    A nd           | Copyright (C) 2011-2020 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2021 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -38,7 +38,7 @@ Description
 #include "timeSelector.H"
 #include "OFstream.H"
 #include "passiveParticleCloud.H"
-#include "writer.H"
+#include "setWriter.H"
 
 using namespace Foam;
 
@@ -210,10 +210,8 @@ int main(int argc, char *argv[])
             tracks[trackI].transfer(allTracks[trackI]);
         }
 
-        autoPtr<writer<scalar>> scalarFormatterPtr = writer<scalar>::New
-        (
-            setFormat
-        );
+        autoPtr<setWriter<scalar>> scalarFormatterPtr =
+            setWriter<scalar>::New(setFormat);
 
         // OFstream vtkTracks(vtkPath/"particleTracks.vtk");
         fileName vtkFile