-changes in gitignore

-changed "absent" to "excluded" everywhere
-added Events support:
 *systems are scanned by handleEvent() function
 *generate system callers for events
 *event sending have (untested) multithreaded support
 *EventInput structure in System has input components for event

dub.json

@@ -10,6 +10,9 @@
 	"dflags-posix-ldc": [
 		"-defaultlib=phobos2-ldc,druntime-ldc"
 	],
+	"dflagss": [
+		"-betterC"
+	],
 	"configurations" : [
 		{
 			"name" : "library",