New JS API serializer

[r0x0r]

The old implementation of JS API serializer (plain JSON.stringify) has a number of limitations. Namely inability to serialize DOM events, nodes or circular references. I have implemented a new serializer that overcomes these limitations. This, in turn, makes possible to add a support for DOM events in Python as proposed here #1212

The code for a new serializer is now in master the dom branch and the actual code can be found here

pywebview/webview/js/api.py

Line 82 in 0c62ed8

_stringify: function stringify(obj) {

As this is quite a big change, I would appreciate feedback and testing, before it makes to the next release. Comments are welcomed.

[r0x0r]

The new serializer is now used inevaluate_js as well. Changes also moved from master to the dom branch and will be released in the next major version.

[r0x0r]

• Functions are omitted altogether from serialization (previously replaced with a "function" string)
• List like objects (ie. NodeList, FileList) are converted to arrays
• Development moved to the 5.0 branch