Add micro version to toolkit version functions

Support micro versions in wxAppTraits::GetToolkitVersion and
wxPlatformInfo functions related to toolkit versions.

interface/wx/apptrait.h

@@ -100,8 +100,8 @@ public:
 
     /**
         Returns the wxWidgets port ID used by the running program and eventually
-        fills the given pointers with the values of the major and minor digits
-        of the native toolkit currently used.
+        fills the given pointers with the values of the major, minor, and micro
+        digits of the native toolkit currently used.
 
         The version numbers returned are thus detected at run-time and not compile-time
         (except when this is not possible e.g. wxMotif).
@@ -109,8 +109,12 @@ public:
         E.g. if your program is using wxGTK port this function will return wxPORT_GTK
         and put in given pointers the versions of the GTK library in use.
         See wxPlatformInfo for more details.
+
+        If a micro version is not available it will have a value of 0.
     */
-    virtual wxPortId GetToolkitVersion(int* major = NULL, int* minor = NULL) const = 0;
+    virtual wxPortId GetToolkitVersion(int* major = NULL,
+                                       int* minor = NULL,
+                                       int* micro = NULL) const = 0;
 
     /**
         Returns @true if @c fprintf(stderr) goes somewhere, @false otherwise.

interface/wx/platinfo.h

@@ -185,13 +185,12 @@ public:
     bool CheckOSVersion(int major, int minor, int micro = 0) const;
 
     /**
-        Returns @true if the toolkit version is at least @c major.minor.
+        Returns @true if the toolkit version is at least @c major.minor.micro.
 
-        @see GetToolkitMajorVersion(),
-             GetToolkitMinorVersion(), CheckOSVersion()
+        @see GetToolkitMajorVersion(), GetToolkitMinorVersion(),
+             GetToolkitMicroVersion(), CheckOSVersion()
     */
-    bool CheckToolkitVersion(int major, int minor) const;
-    
+    bool CheckToolkitVersion(int major, int minor, int micro = 0) const;
 
     /**
         Returns @true if this instance is fully initialized with valid values.
@@ -417,6 +416,21 @@ public:
     */
     int GetToolkitMinorVersion() const;
     
+    /**
+        Returns the run-time micro version of the toolkit associated with this
+        wxPlatformInfo instance.
+
+        Note that if GetPortId() returns @c wxPORT_BASE, then this value is zero
+        (unless externally modified with SetToolkitVersion()); that is, no native
+        toolkit is in use.
+        See wxAppTraits::GetToolkitVersion() for more info.
+
+        @see CheckToolkitVersion()
+
+        @since 3.1.1
+    */
+    int GetToolkitMicroVersion() const;
+    
     //@}
 
 
@@ -497,7 +511,7 @@ public:
     /**
         Sets the version of the toolkit associated with this wxPlatformInfo instance.
     */
-    void SetToolkitVersion(int major, int minor);
+    void SetToolkitVersion(int major, int minor, int micro = 0);
 
     /**
         Sets the operating system description associated with this wxPlatformInfo instance.