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/lit/lit-magic-strings.ini

@@ -214,6 +214,7 @@ LIT_MAGIC_STRING_VALUE_OF_UL = "valueOf"
 LIT_MAGIC_STRING_WEAKMAP_UL = "WeakMap"
 LIT_MAGIC_STRING_WEAKSET_UL = "WeakSet"
 LIT_MAGIC_STRING_EPSILON_U = "EPSILON"
+LIT_MAGIC_STRING_RUNNABLE_UL = "Runnable"
 LIT_MAGIC_STRING_DATAVIEW_UL = "DataView"
 LIT_MAGIC_STRING_FUNCTION_UL = "Function"
 LIT_MAGIC_STRING_INFINITY_UL = "Infinity"