OCaml: Refactor configuration lexer for readability, conciseness

ocaml/lib/utilities/aliases.ml

@@ -1,5 +1,24 @@
-let str_int = string_of_int
+(* an 'alias' is an alternate name with minor or no alterations to behavior *)
+
+(* logging *)
 let print = print_endline
 let elog = Log.elog
+
+(* casts *)
+let str_int = string_of_int
 let chars_str = Text.chars_of_string
 let str_chars = Text.string_of_chars
+
+(* control flow & precedence *)
+let ($) = (@@)
+
+(* lists *)
+type 'a lists = 'a list list
+let ($:) list element = list @ [element]
+let pick index list = List.nth list index
+let rmap = List.rev_map
+let reverse = List.rev
+let length = List.length
+let ifilter = List.filteri
+let imap = List.mapi
+let map = List.map