fix: allow rootUri to be null

Fixes #684

fix(cache): bump cache version

refactor: fix impossible parse_url equality (#676)

`parse_url` returns `false` for malformed urls, not `null`

perf: change index to a tree to speed up completion (#680)

Refactors Index into a tree structure, rather than an array of Fqns to definitions.

Closes #274

fix: cast null to array before passing to array_merge() (#666)

Fixes #595

fix(package): include tests folder

This is needed if you want to extend the buildserver and reuse tests

feat(completion): add pseudo-keywords like int, bool, strict_types to…

… completion

test(performance): don't eat exceptions during benchmark

fix(completion): do not propose <?php if completion context is not gi…

…ven (#593)

fixes #372

fix(completion): don't require constructor parameter for protocol DTO (…

…#592)