gg: add text rendering, keyboard event handling for JS and other fixes (#12932)

vlib/time/time.js.v

@@ -42,3 +42,10 @@ pub fn sleep(dur Duration) {
 	#let toWait = BigInt(dur.val) / BigInt(time__millisecond)
 	#while (new Date().getTime() < now + Number(toWait)) {}
 }
+
+pub fn ticks() i64 {
+	t := i64(0)
+	#t.val = BigInt(new Date().getTime())
+
+	return t
+}

vlib/time/time_js.js.v

@@ -14,7 +14,7 @@ module time
 pub fn sys_mono_now() u64 {
 	$if js_browser {
 		mut res := u64(0)
-		#res = new u64(window.performance.now() * 1000000)
+		#res = new u64(Math.floor(window.performance.now() * 1000000))
 
 		return res
 	} $else $if js_node {