WIP Broken Attributes should not break the whole Entry

[stasm]

This is a WIP. Fix #237.

To do:

• Runtime parser.
• Report the proper error.

[stasm]

@zbraniecki - Asking for your feedback on this. I implemented a naive approach which keeps the attributes parsed so far and the rewinds the index to the beginning of the line in which an error was found. The problem with this approach is that the error reporting is then performed by getEntryOrJunk. The original error message is lost. Do you have a recommendation for how to solve this given the current architecture of the tooling parser?

[Pike]

We could store the attribute error on the parser, and compare its error position with the entry error position, and whoever got further wins?

[stasm]

Yeah, that was my assumption too. I wanted to hear what @zbraniecki thinks of this approach as he is the original author of this code. I'm also not clear if it's better to store the error on the instance of FluentParser or perhaps FTLParserStream.