Moving delimiters and standalone to global vars

tests/help

@@ -53,6 +53,7 @@ Mo uses the following environment variables:
 MO_ALLOW_FUNCTION_ARGUMENTS - When set to a non-empty value, this allows
     functions referenced in templates to receive additional options and
     arguments.
+MO_CLOSE_DELIMITER - The string used when closing a tag. Defaults to "}}".
 MO_DEBUG - When set to a non-empty value, additional debug information is
     written to stderr.
 MO_FUNCTION_ARGS - Arguments passed to the function.
@@ -64,8 +65,13 @@ MO_FAIL_ON_UNSET - When set to a non-empty value, expansion of an unset env
     variable will be aborted with an error.
 MO_FALSE_IS_EMPTY - When set to a non-empty value, the string "false" will
     be treated as an empty value for the purposes of conditionals.
+MO_OPEN_DELIMITER - The string used when opening a tag. Defaults to "{{".
 MO_ORIGINAL_COMMAND - Used to find the `mo` program in order to generate a
     help message.
+MO_STANDALONE_CONTENT - The content that preceeded the current tag. When a
+    standalone tag is encountered, this is checked to see if it only
+    contains whitespace. If this and the whitespace condition after a tag is
+    met, then this will be reset to $'\n'.
 
 Mo is under a MIT style licence with an additional non-advertising clause.
 See LICENSE.md for the full text.

tests/standalone-indentation

@@ -4,14 +4,14 @@ cd "${0%/*}" || exit 1
 
 export content=$'<\n->'
 template() {
-    cat <<EOF
+    cat <<'EOF'
 \
  {{>fixtures/standalone-indentation.partial}}
 /
 EOF
 }
 expected() {
-    cat <<EOF
+    cat <<'EOF'
 \
  |
  <