0028417: Using PRECOMPILED HEADER to speed up compilation time

Use of Cotire tool is introduced for acceleration of CMake builds, by usage of precompiled headers.
CMake option BUILD_USE_PCH is added to enable / disable use of precompiled headers

When precompiled headers are used, additional compiler macros are defined globally in the build system to avoid problems due to different order of included files:
- NOMINMAX is defined on Windows to prevent defining "min" and "max" as macros by windows.h
- STRSAFE_NO_DEPRECATE and _SCL_SECURE_NO_WARNINGS are defined on Windows to prevent declaring functions of standard C library as deprecated by #pragma, and other warnings in system headers
- GL_GLEXT_LEGACY and GLX_GLEXT_LEGACY are defined to ensure that only OCCT's own glext.h is used
- __STDC_FORMAT_MACROS is defined to have standard C print format macros always defined

Code is corrected to avoid conflicts with system headers and in case of compiling together as unity builds (partially):
- Some locally defined variables in TKV3d, TKHLR are renamed to be unique
- Duplicated definitions of macros and global functions are eliminated in TKSTEP
- Useless header WNT_UInt.hxx is removed
- Usage of local variables conflicting with X11 macro is avoided in Draw_Viewer.cxx
- Local variables in AIS_ConcentricRelation.cxx are renamed to avoid conflict with macros defined in windows.h
- HXX files containing code are renamed to PXX or merged with corresponding CXX files.

IVtkTools classes are corrected to avoid compiler warnings disabled in non-PCH builds by inclusion of VTK headers.

Useless pragmas disabling warnings on MSVC are removed

src/OSD/OSD_Chronometer.cxx

@@ -111,7 +111,6 @@ void OSD_Chronometer::GetThreadCPU (Standard_Real& theUserSeconds,
 
 //---------------------------- Systeme WNT --------------------------------
 
-#define STRICT
 #include <windows.h>
 
 //=======================================================================

src/OSD/OSD_DirectoryIterator.cxx

@@ -185,7 +185,6 @@ Standard_Integer OSD_DirectoryIterator::Error()const{
 //------------------------------------------------------------------------
 
 
-#define STRICT
 #include <windows.h>
 
 

src/OSD/OSD_Disk.cxx

@@ -155,9 +155,6 @@ Standard_Integer OSD_Disk::Error()const{
 //---------------------------- Windows NT System --------------------------------
 //-------------------------------------------------------------------------------
 
-#define STRICT
-
-
 #include <OSD_Disk.hxx>
 #include <OSD_OSDError.hxx>
 #include <OSD_Path.hxx>

src/OSD/OSD_Environment.cxx

@@ -232,7 +232,6 @@ Standard_Integer OSD_Environment::Error() const
 //-------------------  WNT Sources of OSD_Environment --------------------
 //------------------------------------------------------------------------
 
-#define STRICT
 #include <windows.h>
 
 #include <OSD_Environment.hxx>

src/OSD/OSD_Error.cxx

@@ -443,7 +443,6 @@ void OSD_Error::Perror() {
 //-------------------  Windows NT sources for OSD_Error ------------------
 //------------------------------------------------------------------------
 
-#define STRICT
 #include <OSD_Error.hxx>
 #include <OSD_ErrorList.hxx>
 #include <TCollection_ExtendedString.hxx>

src/OSD/OSD_FileIterator.cxx

@@ -263,7 +263,6 @@ Standard_Integer OSD_FileIterator::Error()const{
 //-------------------  Windows NT sources for OSD_FileIterator -----------
 //------------------------------------------------------------------------
 
-#define STRICT
 #include <windows.h>
 
 

src/OSD/OSD_FileNode.cxx

@@ -362,7 +362,6 @@ Standard_Integer OSD_FileNode::Error()const{
 //-------------------  WNT Sources of OSD_FileNode ---------------------------
 //----------------------------------------------------------------------------
 
-#define STRICT
 #ifdef NONLS
 #undef NONLS
 #endif

src/OSD/OSD_Host.cxx

@@ -181,7 +181,6 @@ Standard_Integer OSD_Host::Error()const{
 //-------------------  WNT Sources of OSD_Host ---------------------------
 //------------------------------------------------------------------------
 
-#define STRICT
 #include <windows.h>
 
 #include <OSD_Host.hxx>

src/OSD/OSD_Timer.cxx

@@ -44,7 +44,6 @@ static inline Standard_Real GetWallClockTime ()
 #else
 //-------------------  Windows NT  ------------------
 
-#define STRICT
 #include <windows.h>
 
 //=======================================================================

src/OSD/OSD_signal.cxx

@@ -20,7 +20,6 @@
 #ifdef _WIN32
 //---------------------------- Windows NT System --------------------------------
 
-#define STRICT
 #ifdef NOUSER
 #undef NOUSER
 #endif
@@ -615,7 +614,8 @@ LONG _osd_debug ( void ) {
 #include <pthread.h>
 
 #ifdef __linux__
-#include <fenv.h>
+#include  <cfenv>
+//#include  <fenv.h>
 static Standard_Boolean fFltExceptions = Standard_False;
 #endif