The current method of reporting upload errors is based on an exoteric combination of exceptions which makes return error code useless
The Uploader.java message() implementation is too avrdude-dependant to allow easy portability since the upload tools are becoming a lot and very different
With this commit we try to avoid exceptions and only use the external uploader's exit code to decide the status bar message.
The message can be:
- the last line containing "error" string (any case) or
- the usual avrdude message parsing (to keep compatibility with translations)
Needs testing with all platform and all supported upload tools