added meter and keygen elements

Author: mychidarko

example.php

@@ -60,5 +60,11 @@
 				"bently" => "Bently",
 			])
 		]),
+		$ui::_row([
+			$ui::meter("0.8", "80%"),
+			$ui::meter("6", "6/10", ["min" => "0", "max" => "10"]),
+			$ui::meter("80", "very high", ["low" => "60", "high" => "80", "max" => "100"]),
+		]),
+		$ui::keygen("key")
 	])
 ));

src/UI.php

@@ -858,6 +858,29 @@ public static function button(string $text, array $props = []) {
 	public static function fieldset(array $children, array $props = []) {
 		return self::create_element("fieldset", $props, $children);
 	}
+
+	/**
+	 * Html Meter Element
+	 * 
+	 * @param string $value Current Meter "level"
+	 * @param string|array $children Children
+	 * @param array $props Any additional props
+	 */
+	public static function meter(string $value, $children = "", array $props = []) {
+		$props["value"] = $value;
+		return self::create_element("meter", $props, $children);
+	}
+
+	/**
+	 * Html keygen element
+	 * 
+	 * @param string $name Keygen element name prop
+	 * @param array $props Other props
+	 */
+	public static function keygen(string $name, array $props = []) {
+		$props["name"] = $name;
+		return self::create_element("keygen", $props);
+	}
 
 	/*
     |--------------------------------------------------------------------------