Replace fvdl with ffx, allow test without install

Along with replacing fvdl uses with the equivalent ffx commands, this
also switches from using the install path for libstd-*.so and
libtest-*.so to using the build directory (now passed on the command
line). The user no longer needs to run x.py install before running tests
now, and the correct libstd and libtest are detected on run instead of
startup so the test runner can handle recompilations after starting the
testing environment.

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