Make it possible for a module to specify bundling single files

To make sure libQt5QuickParticles.so is loaded for Qt Quick
applications, we need to be able to specify bundling
specific files, not just subdirectories.

Task-number: QTCREATORBUG-9299
Change-Id: I743ee5ea714355ba6398378f4f54b6ede64d4c85
Reviewed-by: Daniel Teske <daniel.teske@digia.com>
Remove managed subdirectories in assets when deploying to Android

We need to make sure there aren't left-over subdirectories in the
assets/ folder when you have used the bundling mechanism for
deployment.

To make this easier, we fix a bug where a missing slash
would cause multiple libraryPrefix() directories with different
suffixes under assets/ instead of just a single one containing
everything managed by creator. When the slash is added we can
simply remove the whole "assets/" + libraryPrefix() directory
recursively.

Task-number: QTCREATORBUG-9294
Change-Id: Ie24b55680d247df458bc70bbc15abdce51605627
Reviewed-by: Daniel Teske <daniel.teske@digia.com>