The current `RelativeTo` design is both more complex and more confusing
than necessary. Its four variants are now reduced to only two. They are
now also represented as different classes, to better communicate the
difference in semantics and also intent.
Change-Id: Ia60fc7a2dfa0f62bdef90dde347fd8603fd3fbf9
This creates a framework similar to the old lang.sh from functional.
Some notable changes:
- instead of having a .flags file, a test.toml can declare flags
- additionally the test.toml can also declare extra files and multiple
runners for the given input file.
- there won't be any old tests hanging around anymore which weren't
deleted properly in the installation
- all files for a single test are defined decleratively and there won't
be any residues
Tests can be placed within the functional2/lang folder
most migrations should be rather clean
Implements: #825
Change-Id: I5f9149903ec5b078008969a4ae77305417c11475