Use Convert.ToDouble rather than a cast to get the Timestamp

[craigminihan]

Post-processing tools (between rec and play/upload) can serialize timestamps as integers which cause PowerSession to throw when casting to double. Rather than forcing decimal places use Convert to mitigate the cast exception.

[ibigbug]

FYI: the failure of casting from Int to Double was due to the number is in an List

[craigminihan]

@ibigbug IMHO Convert should be used unless you explicity know the underlying type, with JSON.NET you can't guarantee the type unless you intervene in the deserialization process

[ibigbug]

It makes sense - considering the casts can be "post-processed" or so. Thanks anyways for contributing.