Add PHP object magic methods to auto completion

I selected the most straight-forward names for the suggested properties
where applicable.
Add several more completions.
Add BC Math completions
Add Gettext completions
Correct switch statement symbols

The previous expressions allowed switch, case, and default to match
anywhere in the source code and become a symbol in the navigator.
Add uniqid completion

As I come across things that don't have completions, I'm adding them if
they're one-off functions like this.
Merge pull request #4 from ErrolSayre/master

Switch symbols and additional autocompletions