Config option for shebang comments

config/config-options/DUK_USE_SHEBANG_COMMENTS.yaml

@@ -0,0 +1,8 @@
+define: DUK_USE_SHEBANG_COMMENTS
+introduced: 2.1.0
+default: true
+tags:
+  - ecmascript2015
+description: >
+  Support parsing of a "shebang" comment ('#!...') on the first line of
+  source text.

config/examples/low_memory.yaml

@@ -112,6 +112,7 @@ DUK_USE_ES7_EXP_OPERATOR: false  # pulls in pow()
 DUK_USE_ENCODING_BUILTINS: false
 DUK_USE_ES6_UNICODE_ESCAPE: false
 DUK_USE_HTML_COMMENTS: false
+DUK_USE_SHEBANG_COMMENTS: false
 DUK_USE_REFLECT_BUILTIN: false
 DUK_USE_ES6: false
 DUK_USE_SYMBOL_BUILTIN: false