* compiler: extract and cleanup error handling functionality into its own file compiler/compile_errors.v
* compiler: implement p.error_with_token_index and p.warn_with_token_index and use them. Fix tests.
* tools/performance_compare: add a 'Source lines in compiler/' line
* MSVC does not have STDOUT_FILENO nor STDERR_FILENO ...
* compiler: change s.line_nr in just one place, so that s.last_nl_pos will be updated in tandem too.
* Cleanup spurious spaces.
* Store ScannerPos info inside the cached tokens.
Use the stored information when errors are encountered.
* Fix#2079 ( cannot use type...in assignment ).
* do not store scannerpos per each token, instead rescan the source once on error to get the position.
* compiler: implement highlighting for errors. Use only line/col info stored in the cached tokens.
* fixing building on windows
* Split can_show_color to _nix and _win files.
