boot loader heap: Remove left over debug variables
boot loader vfs.h: small cleanup
boot loader: Support loading haiku-*.hpkg

... i.e. properly canonically named Haiku system packages.
rule AddFilesToContainer: Support naming files later

* Add "flags" parameter and only supported flag "computeName". When
  specified the "destName" argument is the name of a shell command
  or function that will be called to determine the destination file
  name when the container is built.
* AddFilesToHaikuImage: Pass flags to AddFilesToContainer.
package: Add "info" command

It allows to print individual information from the package meta data.
Name the generated HPKG files properly

* rule AddPackageFilesToHaikuImage: Add "flags" parameter. The only
  supported flag is "nameFromMetaInfo". It causes the packages to be
  copied under their canonical file name onto the image.
* Use the new flag for all generated packages save haiku_loader.hpkg.
HaikuDepot: Wrap dependency resolution in try/catch block.

- Ensure that any exceptions thrown by the package kit are caught
  and handled.