Add more standard types for PHP (#2263)

This pull request addresses issue #2262.

---------

Co-authored-by: Andreas Arvidsson <andreas.arvidsson87@gmail.com>

Author: ZachWatkins

lang/php/code_type.talon-list

@@ -2,10 +2,20 @@ list: user.code_type
 code.language: php
 -
 
-int
-float
-string
-bool
 array
+bool
+callable
+false
+float
+int
+iterable
+mixed
+never
 null
+object
+parent
+self
+static
+string
+true
 void