Choose how many rows or columns when exporting spritesheet

Also made CreateNewImage.tscn, ScaleImage.tscn and OutlineDialogn.tscn scenes of their own, with their respective scripts.

Prefabs/Dialogs/OutlineDialog.tscn

@@ -0,0 +1,59 @@
+[gd_scene load_steps=2 format=2]
+
+[ext_resource path="res://Scripts/Dialogs/OutlineDialog.gd" type="Script" id=1]
+
+[node name="OutlineDialog" type="ConfirmationDialog"]
+margin_right = 200.0
+margin_bottom = 70.0
+script = ExtResource( 1 )
+
+[node name="OptionsContainer" type="GridContainer" parent="."]
+anchor_left = 0.5
+anchor_top = 0.5
+anchor_right = 0.5
+anchor_bottom = 0.5
+margin_left = -92.0
+margin_top = -27.0
+margin_right = 92.0
+margin_bottom = -1.0
+custom_constants/vseparation = 4
+custom_constants/hseparation = 4
+columns = 2
+
+[node name="ThickLabel" type="Label" parent="OptionsContainer"]
+margin_top = 5.0
+margin_right = 139.0
+margin_bottom = 19.0
+text = "Thickness:"
+
+[node name="ThickValue" type="SpinBox" parent="OptionsContainer"]
+margin_left = 143.0
+margin_right = 217.0
+margin_bottom = 24.0
+mouse_default_cursor_shape = 2
+min_value = 1.0
+max_value = 16384.0
+value = 1.0
+suffix = "px"
+
+[node name="OutlineColorLabel" type="Label" parent="OptionsContainer"]
+margin_top = 31.0
+margin_right = 139.0
+margin_bottom = 45.0
+text = "Fill with color:"
+
+[node name="OutlineColor" type="ColorPickerButton" parent="OptionsContainer"]
+margin_left = 143.0
+margin_top = 28.0
+margin_right = 217.0
+margin_bottom = 48.0
+rect_min_size = Vector2( 64, 20 )
+color = Color( 1, 0, 0, 1 )
+
+[node name="DiagonalCheckBox" type="CheckBox" parent="OptionsContainer"]
+margin_top = 52.0
+margin_right = 139.0
+margin_bottom = 76.0
+mouse_default_cursor_shape = 2
+text = "Diagonal outlines"
+[connection signal="confirmed" from="." to="." method="_on_OutlineDialog_confirmed"]