dynamically replace creator version during build

... instead of running a sed script over a lot of files on each
version increment.

src/plugins/coreplugin/coreconstants.h

@@ -35,9 +35,7 @@
 namespace Core {
 namespace Constants {
 
-#define IDE_VERSION_MAJOR 2
-#define IDE_VERSION_MINOR 1
-#define IDE_VERSION_RELEASE 81
+#include "ide_version.h"
 
 #define STRINGIFY_INTERNAL(x) #x
 #define STRINGIFY(x) STRINGIFY_INTERNAL(x)