Global symbol search

[sunverwerth]

First off, great work! I am using your extension during daily development and it works very well.

A feature still missing is global symbol search. (ctrll+p, #)
I started working on a feature branch and it already does the job.

Parsing the whole php-language-server project takes about 10 seconds on my machine.
The php-cli process takes up about 180MB of ram with all symbol information parsed.

Changes made:

• Added support for client:window/* commands
• Added support for server:workspace/* commands
• Refactored symbol database into own set of classes. (Was in Server/TextDocument before)
• Disabled memory limit
• ProtocolStreamReader was blocking the event loop, made non-blocking
• Find all .php files on startup and start parsing one at a time with Loop/nextTick

To do:

• Fix old tests
• Add new tests
• Reduce memory usage. Most of it is the AST, maybe we can throw it away after parsing,
• Figure out solution for blocking STDIN. The current one is a hack. This is a windows limitation, see https://bugs.php.net/bug.php?id=34972

Please let me know what you think about it and if you want any changes made. I can then open a pull request.

[felixfbecker]

Wow, nice work! I really like the refactor into separate classes. I would encourage you to open the PR right because then I can make comments there (you can still add stuff to the branch)

[sunverwerth]

Created the PR. #31