Integrating aiProcess_OptimizeGraph and aiProcess_OptimizeMeshes back into the Assimp core. They're stable enough now.

Moving private members of Assimp::Importer to a pimpl, hopefully solving strange crashes with vc9 debug builds.
Updating assimp_cmd to reflect these changes.

git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@403 67173fc5-114c-0410-ac8e-9d2fd5bffc1f

code/ProcessHelper.h

@@ -45,6 +45,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include "SpatialSort.h"
 #include "BaseProcess.h"
+#include "ParsingUtils.h"
 
 // -------------------------------------------------------------------------------
 // Some extensions to std namespace. Mainly std::min and std::max for all
@@ -190,6 +191,35 @@ inline void ArrayBounds(const T* in, unsigned int size, T& min, T& max)
 	}
 }
 
+// -------------------------------------------------------------------------------
+/** @brief Extract single strings from a list of identifiers
+ *  @param in Input string list. 
+ *  @param out Receives a list of clean output strings
+ *  @sdee #AI_CONFIG_PP_OG_EXCLUDE_LIST
+ */
+inline void ConvertListToStrings(const std::string& in, std::list<std::string>& out)
+{
+	const char* s = in.c_str();
+	while (*s) {
+		SkipSpacesAndLineEnd(&s);
+		if (*s == '\'') {
+			const char* base = ++s;
+			while (*s != '\'') {
+				++s;
+				if (*s == '\0') {
+					DefaultLogger::get()->error("ConvertListToString: String list is ill-formatted");
+					return;
+				}
+			}
+			out.push_back(std::string(base,(size_t)(s-base)));
+			++s;
+		}
+		else {
+			out.push_back(GetNextToken(s));
+		}
+	}
+}
+
 // -------------------------------------------------------------------------------
 /** @brief Compute the newell normal of a polygon regardless of its shape
  *