Update to the new matrix-doc layout and tooling

Among things affecting Quotient, the update involved moving API files
from api/ to data/api/, adding extensions to event schema files, and
switching from ReStructured Text to Markdown as a lightweight markup
language. This commit updates the build system and GTAD configuration
to accommodate for these.

The build system is also more robust now in choosing whether the
update-api target should be provided. Previously the target was provided
whenever GTAD_PATH and MATRIX_DOC_PATH were specified, even if they
did not point to anything valid. CMake now checks that MATRIX_DOC_PATH
is an actual directory and that GTAD_PATH points to an actual file.

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