add pipe operator to tokeniser and ast

Executor and recast TODO

src/lang/tokeniser.ts

@@ -6,7 +6,7 @@ const WORD = /^[a-zA-Z_][a-zA-Z0-9_]*/
 // regex that captures everything between two non escaped quotes and the quotes aren't captured in the match
 const STRING = /^(["'])(?:(?=(\\?))\2.)*?\1/
 // verbose regex for finding operators, multiple character operators need to be first
-const OPERATOR = /^(>=|<=|==|=>|!=|\*|\+|-|\/|%|=|<|>|\||\^)/
+const OPERATOR = /^(>=|<=|==|=>|!= |\|>|\*|\+|-|\/|%|=|<|>|\||\^)/
 
 const BLOCK_START = /^\{/
 const BLOCK_END = /^\}/