Fixed `PopUpList` widget to display correctly non-string objects ...using their `#displayOn:x:y:` / or `#displayString`. The popup menu shown the `#displayString` correctly however the "button" stubbornly used object's `#printString`, making the widget largely unusable with anything but strings. This commit removes this limitation.

@REM -------
@REM make using mingw gnu compiler
@REM type mingwmake, and wait...
@REM do not edit - automatically generated from ProjectDefinition
@REM -------
@SET DEFINES=

@pushd ..\rules
@call find_mingw.bat
@popd
make.exe -N -f bc.mak %DEFINES% %USEMINGW_ARG% %*