Move private classes to the DriverDeveloper Doxygen group

Classes moved are
-Fl_Int_Vector
-Fl_Kdialog_Native_File_Chooser_Driver
-Fl_Zenity_Native_File_Chooser_Driver

src/Fl_Int_Vector.H

@@ -18,6 +18,12 @@
 #ifndef Fl_Int_Vector_H
 #define Fl_Int_Vector_H
 
+/**
+ \cond DriverDev
+ \addtogroup DriverDeveloper
+ \{
+ */
+
 #include <FL/Fl_Export.H>
 
 /** \file src/Fl_Int_Vector.H
@@ -165,4 +171,9 @@ public:
   }
 };
 
+/**
+\}
+\endcond
+*/
+
 #endif // Fl_Int_Vector_H

src/Fl_Int_Vector.cxx

@@ -15,6 +15,12 @@
 //     https://www.fltk.org/bugs.php
 //
 
+/**
+ \cond DriverDev
+ \addtogroup DriverDeveloper
+ \{
+ */
+
 #include "Fl_Int_Vector.H"
 #include <stdlib.h>
 #include <string.h>
@@ -60,3 +66,8 @@ void Fl_Int_Vector::size(unsigned int count) {
   // count <= size_? just truncate
   size_ = count;
 }
+
+/**
+\}
+\endcond
+*/

src/Fl_Native_File_Chooser_Kdialog.H

@@ -17,6 +17,12 @@
 #ifndef FL_KDIALOG_NATIVE_FILE_CHOOSER_H
 #define FL_KDIALOG_NATIVE_FILE_CHOOSER_H 1
 
+/**
+ \cond DriverDev
+ \addtogroup DriverDeveloper
+ \{
+ */
+
 #include <FL/Fl_Native_File_Chooser.H>
 
 class Fl_Kdialog_Native_File_Chooser_Driver : public Fl_Native_File_Chooser_FLTK_Driver {
@@ -53,4 +59,9 @@ class Fl_Kdialog_Native_File_Chooser_Driver : public Fl_Native_File_Chooser_FLTK
   const char *title() const FL_OVERRIDE;
 };
 
+/**
+\}
+\endcond
+*/
+
 #endif // FL_KDIALOG_NATIVE_FILE_CHOOSER_H

src/Fl_Native_File_Chooser_Kdialog.cxx

@@ -14,6 +14,12 @@
 //     https://www.fltk.org/bugs.php
 //
 
+/**
+ \cond DriverDev
+ \addtogroup DriverDeveloper
+ \{
+ */
+
 #include <config.h>
 #include <FL/Fl_Native_File_Chooser.H>
 #include "Fl_Native_File_Chooser_Kdialog.H"
@@ -291,3 +297,8 @@ void Fl_Kdialog_Native_File_Chooser_Driver::title(const char *val)
 const char *Fl_Kdialog_Native_File_Chooser_Driver::title() const {
   return _title;
 }
+
+/**
+\}
+\endcond
+*/

src/Fl_Native_File_Chooser_Zenity.H

@@ -17,6 +17,12 @@
 #ifndef FL_ZENITY_NATIVE_FILE_CHOOSER_H
 #define FL_ZENITY_NATIVE_FILE_CHOOSER_H 1
 
+/**
+ \cond DriverDev
+ \addtogroup DriverDeveloper
+ \{
+ */
+
 #include "Fl_Native_File_Chooser_Kdialog.H"
 
 class Fl_Zenity_Native_File_Chooser_Driver : public Fl_Kdialog_Native_File_Chooser_Driver {
@@ -27,4 +33,9 @@ class Fl_Zenity_Native_File_Chooser_Driver : public Fl_Kdialog_Native_File_Choos
   char *build_command() FL_OVERRIDE;
 };
 
+/**
+\}
+\endcond
+*/
+
 #endif // FL_ZENITY_NATIVE_FILE_CHOOSER_H

src/Fl_Native_File_Chooser_Zenity.cxx

@@ -14,6 +14,12 @@
 //     https://www.fltk.org/bugs.php
 //
 
+/**
+ \cond DriverDev
+ \addtogroup DriverDeveloper
+ \{
+ */
+
 #include <config.h>
 #include "Fl_Native_File_Chooser_Zenity.H"
 #include <stdio.h>
@@ -112,3 +118,8 @@ char *Fl_Zenity_Native_File_Chooser_Driver::build_command() {
 //puts(command);
   return command;
 }
+
+/**
+\}
+\endcond
+*/