Add code to read package indices

This will be used in multiple places, e.g. for nested packages, or to
transmit package information in online repositories.
This format should stay as simple as possible, all the complex metadata
is stored in AppStream XML.
runapp: Correctly pass parameters to the called app
Split out visual-ldd

This should be an external project (and also depends on Listaller
components right now)
Drop example spec file: It's heavily out of date
Adjust Listaller parts for Limba
Update AUTHORS
Make limba translatable
Add RELEASE instructions
Release version 0.1.0
trivial: post release version bump
Add short note about releases
Add write-support for package-index
Implement support for installing packages with embedded dependencies
trivial: Fix testsuite
Implement embedded-dependency generation into package builder

It is now sufficient to just dump dependencies your software depends on
into the "repo" subdirectory of your "pkginstall" folder.
The lipkgen tool will then perform the remaining steps.
(The dependency needs to be packaged as Limba package)
Get rid of li_touch_dir helper

Using g_mkdir_with_parents is the much nicer solution.
trivial: Post-release version bump
Compress base IPK archive using GZip
Make API a bit more GUI-friendly
Allow using a different AppStream library for data loading