remove state generic from a lot of things

src/widget/position/pad.rs

@@ -1,16 +1,16 @@
 use crate::prelude::*;
 
-pub struct Pad<State> {
+pub struct Pad {
     pub padding: Padding,
-    pub inner: WidgetHandle<State>,
+    pub inner: WidgetHandle,
 }
 
-impl<State: 'static> Widget<State> for Pad<State> {
-    fn draw(&mut self, painter: &mut Painter<State>) {
+impl Widget for Pad {
+    fn draw(&mut self, painter: &mut Painter) {
         painter.widget_within(&self.inner, self.padding.region());
     }
 
-    fn desired_width(&mut self, ctx: &mut SizeCtx<State>) -> Len {
+    fn desired_width(&mut self, ctx: &mut SizeCtx) -> Len {
         let width = self.padding.left + self.padding.right;
         let height = self.padding.top + self.padding.bottom;
         ctx.outer.x.abs -= width;
@@ -20,7 +20,7 @@ impl<State: 'static> Widget<State> for Pad<State> {
         size
     }
 
-    fn desired_height(&mut self, ctx: &mut SizeCtx<State>) -> Len {
+    fn desired_height(&mut self, ctx: &mut SizeCtx) -> Len {
         let width = self.padding.left + self.padding.right;
         let height = self.padding.top + self.padding.bottom;
         ctx.outer.x.abs -= width;