Inherits direct::gui::DirectWaitBar::DirectWaitBar, and direct::p3d::PackageInstaller::PackageInstaller.
This class presents a PackageInstaller that also inherits from
DirectWaitBar, so it updates its own GUI as it downloads.
Specify perPackage = True to make the progress bar reset for each
package, or False (the default) to show one continuous progress
bar for all packages.
Specify updateText = True (the default) to update the text label
with the name of the package or False to leave it up to you to set
You can specify a callback function with finished = func; this
function will be called, with one boolean parameter, when the
download has completed. The parameter will be true on success, or
false on failure.