Either by casting, or switching to a more appropriate type
for the variable.

This prevents unhandled exceptions if the file isn't found.

For 16-bit and 8-bit datasets, you can now run encperf with an argument of
-translate=0 to benchmark just the encoder without converting the datasets to
24-bit.  This allows the output of encperf to be directly compared with that
of the TurboVNC Benchmark Tools.

GCC lets this slide, but other compilers (clang) complain about using % rather
than %% to print a literal % character.

Explicitly add the compression level to the list of encodings so it's obvious
how to override it.

Report encoded and raw-equivalent bytes as well as compression ratio (I like
to have these statistics so I can compute overall compression ratios for
groups of datasets in a spreadsheet.)

Code formatting tweaks to improve readability & make the code consistent with
the rest of TigerVNC

We want to have other tests related to pixel conversion, so avoid
possible naming conflicts.

There is nothing using these classes anymore, so remove the clutter.

This is a lot easier and cheaper than having to set up a complete
PixelTransformer object.

Gets rid of a loooot of code and complexity.

Colour map clients are still supported through an
automatically generated map, but we lose the ability to
develop a client or server that uses colour maps
internally.

Add a tests directory where we can put tests programs that can
be useful during testing. Start with a speed test for the pixel
conversion routines.