Allow test repos to be kept locally

We no longer assume that the test repos don’t exist when we run run-tests.sh. This allows developers to choose to keep them, to allow them to run the tests more quickly.

- Add the test repos to the .gitignore.
- Check if the directory for each repo already exists, before trying to clone it.
- Do a `git pull` for each repo, to ensure that existing copies of repos are up-to-date.

Signed-off-by: Ben10do <[email protected]>

.gitignore

@@ -5,3 +5,7 @@ rgbgfx
 *.o
 *.exe
 .checkpatch-camelcase.*
+
+test/pokecrystal/*
+test/pokered/*
+test/ucity/*