Move image render functions into pages (#291)

Move image page renderes into seperate files

src/ui/images/image_resize.rs

@@ -0,0 +1,11 @@
+pub fn clamp_to_width(size: &mut egui::Vec2, max_width: f32) {
+    let mut x = size.x;
+    let mut y = size.y;
+    if size.x > max_width {
+        let ratio = size.y / size.x;
+        x = max_width;
+        y = x * ratio;
+    }
+    size.x = x;
+    size.y = y;
+}