Rework module parsing and execution (#4462)

This patch disables automatic detection of module code, and instead
requires the user to explicitly specify whether to parse a source
as a module or as a script.

To achieve this the jerry_parse API function now takes a new option
which signals that the source should be parsed as a module.

JerryScript-DCO-1.0-Signed-off-by: Dániel Bátyai daniel.batyai@h-lab.eu

jerry-core/include/jerryscript-core.h

@@ -115,7 +115,8 @@ typedef enum
 typedef enum
 {
   JERRY_PARSE_NO_OPTS = 0, /**< no options passed */
-  JERRY_PARSE_STRICT_MODE = (1 << 0) /**< enable strict mode */
+  JERRY_PARSE_STRICT_MODE = (1 << 0), /**< enable strict mode */
+  JERRY_PARSE_MODULE = (1 << 1) /**< parse source as an ECMAScript module */
 } jerry_parse_opts_t;
 
 /**