Demo manager try load packages in wrong order

[SeriousBuggie]

As mentioned in #25, demo manager for display packages in grid sort it by name of package.
Which is fine.

But later this sorted order used for try load packages one-by-one, for determine if all packages for demo is ok.
Which is not fine, if there appear some dependency between packages.

This partially "solved" via loop with O^2 complexity.

Need remake order of load into which specified in demo file. Possible leave hack with loop.