Go PHP parser

A port of php7parser (No longer accessible) by Ben Mewburn to Go

Reasons

• My first project in Go and this project is an excuse to learn go
• Performance is what I am looking for, Intelephense used to use php7parser which is very fast
• Will be the base for my PHP language server in the future
• Since Go is compile language so hopefully I can squeeze a little bit more performance out of the language itself