- Add the remaining test cases
- Rename some sdk test cases to keep their name shorter

Signed-off-by: Luis Araujo <luis.araujo@collabora.co.uk>

- Add support to add web links.
- Add support to attach images.
- Update test cases to make use of web links.
- Add new ported test cases.
- Add images files required by test cases.

Signed-off-by: Luis Araujo <luis.araujo@collabora.co.uk>

Signed-off-by: Luis Araujo <luis.araujo@collabora.co.uk>

- Update the README listing existing macros and how to
  use the renderer.
- Rename the main program to render-test-case
- Rename the tc directory to tests-cases

Signed-off-by: Luis Araujo <luis.araujo@collabora.co.uk>