Allow to see the entries of ES6 Map and Set

[felixfbecker]

Currently they only display map or set, they should work like objects / arrays. For Set, basically what you get for Array.from(set).

[weinand]

@felixfbecker the v8 debugging protocol doesn't provide that information. I will have to inject code into the debugger for that.

[felixfbecker]

Couldn't you execute eval commands to get the contents?

[weinand]

@felixfbecker yeah, that's my last resort... The problem with that approach is that I'm getting real objects instead of debug handles. This is a completely different world, e.g. property getters are called transparently etc.

[weinand]

Fix in branch improvedDataTypes or April release.