meshconvert tool updates for some POSIX like support #91
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The meshconvert tool is a Windows command-line tool, and so doesn't follow POSIX utility conventions. This PR, however, adds support for a few specific behaviors:
All paths read from the command-line or from -flist files are normalized to the Windows path separator, so the tool now accepts UNIX-style paths or Windows-style paths. In order to allow the input filenames to start with a
/
, you can use--
as an escape to indicate the 'end of options' which will allow input filenames to start with either-
or/
.