Let's make this readable!
* Key names have had wrapping quotes removed, except for non-schema keys
(i.e. part of the PHP language definition rather than the language
schema)
* Comment keys moved to multi-line strings for readability
* Whitespace `(?x)` regexes have been cleaned up and formatted -- they
had both actual whitespace and escaped whitespace!
* Capture indicies collapsed for better readability

Note: This file is functionally the same as it was before, this has just
been a reformat and tidy

This seems to be a hold-over from the XML/PLIST format from TM.