Commits on Nov 15, 2021

1. Add "extended errors" …

   The lexer and parser now always return a ParseError; the Error() method
   is mostly unchanged:
   
   	toml: line 1 (last key "x.key"): newlines not allowed within inline tables
   
   This adds an ErrorWithLocation() method, which will add some context
   where the error occurred, similar to e.g. clang or the Rust compiler:
   
   	toml: error: newlines not allowed within inline tables
   
   	At line 1, column 18:
   
   	      1 | x = [{ key = 42 #
   				   ^
   
   And the ErrorWithUsage() also adds some usage guidance (not always
   present):
   
   	toml: error: newlines not allowed within inline tables
   
   	At line 1, column 16:
   
   	      1 | x = [{ key = 42
   				 ^
   	Error help:
   
   		Inline tables must always be on a single line:
   
   		    table = {key = 42, second = 43}
   
   		It is invalid to split them over multiple lines like so:
   
   		    # INVALID
   		    table = {
   			key    = 42,
   			second = 43
   		    }
   
   		Use regular for this:
   
   		    [table]
   		    key    = 42
   		    second = 43
   
   The line/column information should now also always be correct, and a
   number of error message have been tweaked a bit.
   
   Fixes #201
   Fixes #217

   

   arp242 committed Nov 15, 2021
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