Only Qt 5.12 got true ECMA Script capabilities, so arrow function
expressions are not supported before that.
To be able to use "regular" inline functions, we allow usage of } by escaping with backslash.
For variables that do not start with "JS:" we already supported backslash for escaping.
Fixes: QTCREATORBUG-22336
Change-Id: I9fc638e64d2757a21fffc16355635e2fcff87a36
Reviewed-by: Christian Stenger <christian.stenger@qt.io>