TRY instead of OPT/MAYBE in PARSE

TRY is as short as OPT and is a "real" word.

MAYBE is also reclaimed for future use.

main.reb

@@ -94,7 +94,7 @@ export main: adapt :console [
     ;
     let autorun: null
     let importing: false
-    parse system.options.args [maybe some [
+    parse system.options.args [try some [
         start: <here>
         ||
         ; local, remote, tracing_on, git_commit not passed through by the

replpad.reb

@@ -283,15 +283,15 @@ replpad-write: func [
     ; https://developer.mozilla.org/en-US/docs/Web/CSS/white-space
 
     let url-rule: [
-        "http" opt "s" ":" to ["]" | ")" | {"} | "'" | space | newline | end]
+        "http" try "s" ":" to ["]" | ")" | {"} | "'" | space | newline | end]
     ]
 
     ; UPARSE is still orders of magnitude slower than native PARSE.  Until that
     ; is remedied, don't use it for main printing output.
 
     let url
     parse3 param: copy param [
-        maybe some [
+        try some [
             change '< ("&lt;")
             | change '> ("&gt;")
             | change '& ("&amp;")
@@ -393,7 +393,7 @@ CORSify-gitlab-port: func [
         "/"
         emit user: between <here> "/"
         emit repo: between <here> "/"
-        [opt "-/"]  ; TBD: figure out what this is for, but skip for now
+        [try "-/"]  ; TBD: figure out what this is for, but skip for now
         "raw/"
         emit branch: between <here> "/"
         emit file_path: between <here> <end>

tests/interactive.test.reb

@@ -150,9 +150,9 @@ k: ok: okay: function [
 
     steps: parse steps [
         label: issue!
-        opt bug: integer!  ; optional GitHub issue number
+        try bug: integer!  ; optional GitHub issue number
         description: across [some text!] (print description)
-        opt [code: group! (do as block! code)]
+        try [code: group! (do as block! code)]
         accept <here>
     ] else [
         fail "Problem in STEPS parsing"