Fixed unittests and betterC compilation (after adding fullyQualifiedName instead of simple stringof)

-added new trait to get full name of structure (witho module and package, not tested on more nested packages)
-some small improvements (like adding const to function which need it)

dub.json

@@ -118,7 +118,8 @@
 				"-unittest"
 			],
 			"dflags-gdc": [
-				"-fno-druntime"
+				"-fno-druntime",
+				"-lpthread"
 			],
 			"sourcePaths": ["source/","tests/"],
 			"mainSourceFile":"tests/runner.d",