0023457: Slow text rendering

Added class Font_FTFont wrapper over FreeType face

Unify collections methods NCollection_Array1, NCollection_Sequence, NCollection_Vector:
declare Upper, Lower, First, Last, ChangeFirst, ChangeLast methods for all these collections.

Added method NCollection_DataMap::Find() with check key is bound + retrieve value within single call interface.

OpenGl_Context::ReleaseResource() method now supports lazy release of shared resources.

Added class OpenGl_Font which implements textured fonts support.
Added class OpenGl_TextFormatter for text formatting using OpenGl_Font.

OpenGl_Text was redesigned to use OpenGl_FontFormatter.

OpenGl_FontMgr class was removed.
All methods related to text rendered removed from OpenGl_Display class.

OpenGl_Trihedron and OpenGl_GraduatedTrihedron classes were redesigned
to use OpenGl_Text.

OpenGl_PrinterContext instance was moved to OpenGl_GraphicDriver fields
(eliminated usage of global instance).

Added test cases into 3rdparty/fonts grid to check different font styles
and perform FPS tests (no automated results - requires manual analysis
or snapshots comparisons).

Removed unused CSF_FTGL dependency.
OpenGl_Text::setupMatrix - do not apply floor for myWinZ

src/NCollection/NCollection_Array1.hxx

@@ -221,6 +221,30 @@ template <class TheItemType> class NCollection_Array1
     return *this; 
   }
 
+  //! @return first element
+  const TheItemType& First() const
+  {
+    return myData[myLowerBound];
+  }
+
+  //! @return first element
+  TheItemType& ChangeFirst()
+  {
+    return myData[myLowerBound];
+  }
+
+  //! @return last element
+  const TheItemType& Last() const
+  {
+    return myData[myUpperBound];
+  }
+
+  //! @return last element
+  TheItemType& ChangeLast()
+  {
+    return myData[myUpperBound];
+  }
+
   //! Constant value access
   const TheItemType& Value (const Standard_Integer theIndex) const
   {