Create Parser Passes to Translate PHP Standard Library and Common Packages to Idiomatic Go

[stephens2424]

To do an intermediate transpile, we will need to translate common PHP functions and classes to Go equivalents. This may happen at two levels. The first is to provide functional equivalent implementations of the same functions. These functions would be available to transpiled programs as a package. The second is to provide compiler passes that translate these functions to their idiomatic Go equivalents.

This issue will be closed when the both of these are completed.