use builtin hash functions instead of rolling my own

src/ugui_button.c3

@@ -5,7 +5,7 @@ import std::io;
 // draw a button, return the events on that button
 fn ElemEvents! Ctx.button(&ctx, String label, Rect size)
 {
-	Id id = hash(label);
+	Id id = label.hash();
 
 	Elem *parent = ctx.get_parent()!;
 	Elem *c_elem = ctx.get_elem(id)!;

src/ugui_data.c3

@@ -104,22 +104,6 @@ fault UgError {
 	UNEXPECTED_ELEMENT,
 }
 
-fn Id fnv1a(String str)
-{
-	const ulong FNV_OFF   = 0xcbf29ce484222325;
-	const ulong FNV_PRIME = 0x100000001b3;
-
-	ulong hash = FNV_OFF;
-	foreach (c : str) {
-		hash ^= c;
-		hash *= FNV_PRIME;
-	}
-
-	return hash;
-}
-
-macro hash(String str) { return fnv1a(str); }
-
 macro uint_to_rgba(uint u) {
 	return Color{
 		.r = (char)((u >> 24) & 0xff),

src/ugui_div.c3

@@ -4,7 +4,7 @@ import std::io;
 
 fn void! Ctx.div_begin(&ctx, String label, Rect size)
 {
-	Id id = hash(label);
+	Id id = label.hash();
 
 	Elem *parent = ctx.get_parent()!;
 	Elem* c_elem = ctx.get_elem(id)!;

src/ugui_impl.c3

@@ -28,7 +28,7 @@ macro Ctx.get_elem(&ctx, Id id)
 // if it does't find one
 macro Ctx.get_elem_by_label(&ctx, String label)
 {
-    Id id = hash(label);
+    Id id = label.hash();
     return ctx.cache.search(id);
 }
 

src/ugui_slider.c3

@@ -9,7 +9,7 @@ import std::io;
  */
 fn ElemEvents! Ctx.slider_hor(&ctx, String label, Rect size)
 {
-    Id id = hash(label);
+    Id id = label.hash();
 
 	Elem *parent = ctx.get_parent()!;
 	Elem *c_elem = ctx.get_elem(id)!;
@@ -81,7 +81,7 @@ fn ElemEvents! Ctx.slider_hor(&ctx, String label, Rect size)
  */
 fn ElemEvents! Ctx.slider_ver(&ctx, String label, Rect size)
 {
-	Id id = hash(label);
+	Id id = label.hash();
 
 	Elem *parent = ctx.get_parent()!;
 	Elem *c_elem = ctx.get_elem(id)!;