Automate version generation

Version is now generated automatically based on git tags.
Both cases are handled: building from git tree and building tarball downloaded from github.

Works for qmake and cmake

limereport/version.h.in

@@ -0,0 +1,9 @@
+#pragma once
+
+// git will put "#define GIT_ARCHIVE 1" on the next line inside archives. $Format:%n#define GIT_ARCHIVE 1$
+
+#ifdef GIT_ARCHIVE
+#define LIMEREPORT_VERSION_STR "$Format:%(describe:tags=true)$"
+#else
+#define LIMEREPORT_VERSION_STR "@GIT_VERSION@"
+#endif