add custom image picker

src/ImagePicker.tscn

@@ -0,0 +1,69 @@
+[gd_scene load_steps=3 format=2]
+
+[ext_resource path="res://src/ImagePicker.gd" type="Script" id=1]
+[ext_resource path="res://src/FileList.tscn" type="PackedScene" id=2]
+
+[node name="ImagePicker" type="Panel"]
+anchor_right = 1.0
+anchor_bottom = 1.0
+script = ExtResource( 1 )
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[node name="VBoxContainer" type="VBoxContainer" parent="."]
+anchor_right = 1.0
+anchor_bottom = 1.0
+rect_clip_content = true
+alignment = 1
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[node name="TabContainer" type="TabContainer" parent="VBoxContainer"]
+margin_right = 1024.0
+margin_bottom = 512.0
+size_flags_horizontal = 3
+size_flags_vertical = 3
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[node name="Taqin" type="Tabs" parent="VBoxContainer/TabContainer"]
+anchor_right = 1.0
+anchor_bottom = 1.0
+margin_left = 8.0
+margin_top = 61.0
+margin_right = -8.0
+margin_bottom = -8.0
+rect_clip_content = true
+
+[node name="FileList" parent="VBoxContainer/TabContainer/Taqin" instance=ExtResource( 2 )]
+
+[node name="Filesystem" type="Tabs" parent="VBoxContainer/TabContainer"]
+visible = false
+anchor_right = 1.0
+anchor_bottom = 1.0
+margin_left = 8.0
+margin_top = 61.0
+margin_right = -8.0
+margin_bottom = -8.0
+
+[node name="FileList" parent="VBoxContainer/TabContainer/Filesystem" instance=ExtResource( 2 )]
+root_dir = "/home/fabs/Pictures"
+walkable = true
+
+[node name="Button" type="Button" parent="VBoxContainer"]
+margin_top = 520.0
+margin_right = 1024.0
+margin_bottom = 600.0
+rect_min_size = Vector2( 0, 80 )
+text = "Cancel"
+flat = true
+__meta__ = {
+"_edit_use_anchors_": false
+}
+[connection signal="item_rect_changed" from="." to="." method="_on_ImagePicker_item_rect_changed"]
+[connection signal="resized" from="." to="." method="_on_ImagePicker_resized"]
+[connection signal="file_selected" from="VBoxContainer/TabContainer/Taqin/FileList" to="." method="_on_FileList_file_selected"]
+[connection signal="file_selected" from="VBoxContainer/TabContainer/Filesystem/FileList" to="." method="_on_FileList_file_selected"]