move to SetPad(), SetMargin() and SetExpand()

Signed-off-by: Jeff Carr <jcarr@wit.com>

README.md

@@ -0,0 +1,11 @@
+# widget
+
+Package gui/widget defines the widgets and actions that can be performed on them
+
+Principles:
+
+```go
+* Make code using this package simple to use
+* Widget names should try to match [Wikipedia Graphical widget]
+* It's ok to guess. Try to do something sensible.
+```

action.go

@@ -16,6 +16,13 @@ type Action struct {
 	// how to arrange widgets
 	Direction Orientation
 
+	// All the strings for things like dropdown menus
+	// They must be sent in display order
+	// These must be unique
+	Strings []string
+
+	Range	RangeType
+
 	// This is used for things like a slider(0,100)
 	X      int
 	Y      int
@@ -47,10 +54,13 @@ const (
 	Hide
 	Enable
 	Disable
+	SetMargin
 	Margin
 	Unmargin
+	SetPad
 	Pad
 	Unpad
+	SetExpand
 	Append
 	Move
 	Dump

range.go

@@ -0,0 +1,10 @@
+package widget
+
+// Range(1, 10) includes the values 1 and 10
+// almost all toolkits use integers so there doesn't
+// seem to be a good idea to use 'type any' here as it
+// just makes things more complicated for no good reason
+type RangeType struct {
+	Low int
+	High int
+}

reflect.go

@@ -1,10 +1,36 @@
 package widget
 
+/*
+	widget is a low level package that just defines the gui package
+	interaction with the toolkits.
+
+	For simplicity, it seems to make sense to put type conversion functions
+	here for now
+*/
+
 import (
 	"reflect"
 	"strconv"
 )
 
+/*
+// TODO: this syntax or the other syntax?
+
+func convertString(val any) string {
+	switch v := val.(type) {
+	case bool:
+		n.B = val.(bool)
+	case string:
+		n.label = val.(string)
+		n.S = val.(string)
+	case int:
+		n.I = val.(int)
+	default:
+		log.Error(errors.New("Set() unknown type"), "v =", v)
+	}
+}
+*/
+
 func GetString(A any) string {
 	if A == nil {
 		// log.Warn("getString() got nil")