wxPython4 sequels: fix exception in connection dialog, force black text in FBD.
- wxPython4 does not have RemoveSizer in API anymore.
- On GTK3 with dark theme default text colour is white, making it unreadable.
<?xml version='1.0' encoding='utf-8'?>
<BeremizRoot URI_location="LOCAL://">
<TargetType/>
<Libraries Enable_SVGHMI_Library="true"/>
</BeremizRoot>