Report file names on errors about dora HOT 3 CLOSED

Here are some action points that could be done when working on this:

• Read source file into string and then parse/lex String instead of the File
• Keep all file strings in a table and use an index to identify a file
• Move file into Position
• Position then stores file, line and column. Let's have a location map (e.g. HashMap<u32, (u32, u32, u32)) and make Position an index into that map. Position should than be defined as Position(u32), this should save some memory and allow for faster copying of Positions.
• Keep indices of start of line numbers in a table, we can use this to print the full line in source code to highlight errors

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@dinfuehr I think you did a lot of work here recently, do you feel this has been resolved for good?

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Closing this, feel free to reopen, @dinfuehr!

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