Change Input/TextArea ValueBinder interface

fixes #1

.vscode/settings.json

@@ -1,5 +1,6 @@
 {
     "cSpell.words": [
+        "borderless",
         "Dadido",
         "datetime",
         "domrender",
@@ -7,6 +8,7 @@
         "ldflags",
         "Segoe",
         "simplehttp",
+        "Sprintf",
         "Typer",
         "vgrouter",
         "Vogel",

components/input/text-area.go

@@ -9,12 +9,12 @@ import (
 type TextArea struct {
 	AttrMap vugu.AttrMap
 
-	Bind *string
+	Bind ValueBinder
 }
 
 func (c *TextArea) content() string {
 	if c.Bind != nil {
-		return *c.Bind
+		return c.Bind.StringValue()
 	}
 
 	return ""
@@ -24,6 +24,6 @@ func (c *TextArea) handleChange(event vugu.DOMEvent) {
 	val := event.PropString("target", "value")
 
 	if c.Bind != nil {
-		*c.Bind = val
+		c.Bind.SetStringValue(val) // TODO: Error is omitted, we should show it
 	}
 }

page-input.vugu

@@ -122,7 +122,7 @@
 		<input:Tags :Bind="input.ListBindGenericSlice[string]{Slice: &c.tags1Slice}" id="page-tags-1"></input:Tags>
 
 		<h2>Text-area</h2>
-		<input:TextArea :Bind="&c.textArea1" id="page-text-area-1" rows="10" style="width:100%; resize:none; box-sizing:border-box;"></input:TextArea>
+		<input:TextArea :Bind="input.ValueBindAny{&c.textArea1}" id="page-text-area-1" rows="10" style="width:100%; resize:none; box-sizing:border-box;"></input:TextArea>
 		<pre vg-content='fmt.Sprintf("Your entered text: %s", c.textArea1)'></pre>
 
 	</layout:Container>

page-input_vgen.go

@@ -1272,7 +1272,7 @@ func (c *PageInput) Build(vgin *vugu.BuildIn) (vgout *vugu.BuildOut) {
 						vgin.BuildEnv.WireComponent(vgcomp)
 					}
 					vgin.BuildEnv.UseComponent(vgcompKey, vgcomp)	// ensure we can use this in the cache next time around
-					vgcomp.Bind = &c.textArea1
+					vgcomp.Bind = input.ValueBindAny{&c.textArea1}
 					vgcomp.AttrMap = make(map[string]interface{}, 8)
 					vgcomp.AttrMap["id"] = "page-text-area-1"
 					vgcomp.AttrMap["rows"] = "10"