Custom Parsing

[scottPlusPlus]

Allows custom parsing/writing of Classes or Fields via @:jcustomparse/@:jcustomwrite attributes

Main drive was to allow for parsing Dynamics. Happy to make any changes / address concerns.

[elnabo]

It is a nice idea, thanks for the PR !

Just two little things.

• Could you replace the trace when the custom writer/parser is invalid with Context.fatalError instead. I'd rather see the errors at compile time.
• Also a test of invalid parsing with a custom parser

[scottPlusPlus]

I swapped out the traces, great call!

I'm not sure I follow about "test of invalid parsing with a custom parser". If I include an invalid parser that doesn't compile, then the test wouldn't compile either?

[elnabo]

Ok, I'll try to add a test later.

Could you swap the final to var so we can continue to support Haxe 3, before I merge it. I forgot it broke the CI.

[scottPlusPlus]

finals swapped. If you manage to get a test working I'll love to see how you did it.

[elnabo]

Thanks for the changes. I'll try to add a test by the end of the end week with the updated readme

[ibilon]

Thanks for the PR, it's quite a useful feature. I've released json2object 3.8.0, the errors thrown inside a custom parser are now available in parser.errors.