Initial import HTML5 support for attributes and input types.

Attributes
- Added support for new HTML5 attributes.
missing support for : form, list, and multiple attributes.

Input types: added the all the new input types.

Added test cases, still in progress.

tests/server/wsf_html/wsf_form_number_input.e

@@ -0,0 +1,40 @@
+note
+	description: "[
+		Represent the input type number.
+		Example:
+		<input type="number" min="5" max="18" step="0.5" value="9" name="shoe-size">
+	]"
+	date: "$Date$"
+	revision: "$Revision$"
+	EIS: "name= Number", "src=https://html.spec.whatwg.org/multipage/forms.html#number-state-(type=number)"
+
+class
+	WSF_FORM_NUMBER_INPUT
+
+inherit
+
+	WSF_FORM_INPUT
+		redefine
+			specific_input_attributes_string
+		end
+
+	WSF_FORM_WITH_NUMERIC_ATTRIBUTE
+
+create
+	make,
+	make_with_text
+
+feature -- Access
+
+	input_type: STRING = "number"
+
+feature {NONE} -- Conversion
+
+	specific_input_attributes_string: detachable STRING_8
+			-- Specific input attributes if any.	
+			-- To redefine if needed
+		do
+			create Result.make_empty
+			append_numeric_input_attributes_to (Result)
+		end
+end