-removed UpdateBySystems version switch (it's now default behaviour)

-beginRegister() and endRegister() was added (every register functions must be called between this calls, update calls can't be called there)
-SystemCallers and Systems dependecies is rebuild always in endRegister();
-beginRegister() clear all SystemCallers and Systems dependencies
-possibility to get System ID and execution state
-JobGroup has now pointer to it's parent (SystemCaller)
-SystemCaller clean up destructor

tests/tests.d

@@ -285,6 +285,7 @@ import std.meta;
 	gEM.setJobDispachFunc(&dispatch);
 	assert(gEM !is null);
 
+	gEM.beginRegister();
 	gEM.registerPass("fixed");
 
 	MonoTime time = MonoTime.currTime;
@@ -306,6 +307,7 @@ import std.meta;
 	gEM.registerSystem!TestSystem(0);
 	//gEM.registerSystem!TestSystemWithHighPriority(100);
 	//gEM.registerSystem!TestSystem2(0);
+	gEM.endRegister();
 
 	dur = (MonoTime.currTime - time).total!"usecs";
 	writeln("Systems register: ", dur, " usecs");
@@ -368,9 +370,11 @@ import std.meta;
 
 	//foreach(j; 0..1_000)gEM.addEntity(tmpl);
 
+	gEM.beginRegister();
 	gEM.registerSystem!TestSystem2(0);
+	gEM.endRegister();
 
-	gEM.generateDependencies();
+	//gEM.generateDependencies();
 
 	//assert(*(cast(EntityID*)(cast(void*)tmpl.info.first_block+24)) == EntityID(1,1));
 	//assert(*(cast(EntityID*)(cast(void*)tmpl.info.first_block+48)) == EntityID(1,1));