remove u8 and i32 from tests and examples

vlib/builtin/int.v

@@ -81,20 +81,20 @@ pub fn (nn u32) str() string {
 }
 
 /*
-pub fn (nn u8) str() string {
+pub fn (nn byte) str() string {
 	 mut n := nn
-	if n == u8(0) {
+	if n == byte(0) {
 		return '0'
 	}
 	max := 5
 	mut buf := malloc(max)
 	mut len := 0
 	// Fill the string from the end
-	for n > u8(0) {
-		d := n % u8(10)
-		buf[max - len - 1] = d + u8(`0`)
+	for n > byte(0) {
+		d := n % byte(10)
+		buf[max - len - 1] = d + byte(`0`)
 		len++
-		n = n / u8(10)
+		n = n / byte(10)
 	}
 	return tos(buf + max - len, len)
 }