Signed-off-by: James Hilliard <james.hilliard1@gmail.com>

Due to flit removing the setup.py generation from the default sdist
releases we need to add a hook that generates them before we can do
a build and install using distutils.

Installing flit/flit-core is also a bit tricky since we also need
to generate setup.py's for them as well, we can do this by adding
their build directories to path and calling the internal methods
required to do the setup.py generation.

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>

These packages don't have a setup.py so we instead need to parse their
pyproject.toml file.

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>

This version now requires flit package infrastructure.

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
---
Changes v1 -> v2:
  - rebased on next
  - bump version instead of add package