Fix Haxe5 EventLoop compilation

Author: yuxiaomao

h3d/impl/Benchmark.hx

@@ -347,7 +347,7 @@ class Benchmark extends h2d.Graphics {
 		var totalName = measureCpu ? "cpu" : "gpu";
 		#if target.threaded
 		if (measureCpuThread != null) {
-			var n = measureCpuThread.getName();
+			var n = #if (haxe_ver >= 5) measureCpuThread.name #else measureCpuThread.getName() #end;
 			if (n != null)
 				totalName = n;
 		}

h3d/impl/DX12Driver.hx

@@ -1911,7 +1911,7 @@ class DX12Driver extends h3d.impl.Driver {
 			srvRingBuf = hl.CArray.alloc(SrvArgs, 256);
 			#if !console
 			var thread = sys.thread.Thread.create(runThread);
-			thread.setName("DX12");
+			#if (haxe_ver >= 5) thread.name = "DX12"; #else thread.setName("DX12"); #end
 			#end
 		}
 

hxd/System.hl.hx

@@ -155,7 +155,9 @@ class System {
 			try {
 				hl.Api.setErrorHandler(reportError); // set exception trap
 			#end
-				#if ( target.threaded && (haxe_ver >= 4.2) )
+				#if ( haxe_ver >= 5 )
+				mainThread.events.loopOnce();
+				#elseif ( target.threaded && (haxe_ver >= 4.2) )
 				// Due to how 4.2+ timers work, instead of MainLoop, thread events have to be updated.
 				// Unsafe events rely on internal implementation of EventLoop, but utilize the recycling feature
 				// which in turn provides better optimization.