Fixes some bugs in examples and factorize some code, test them in CI

[illwieckz]

Fixes some bugs in examples and factorize some code.

The examples are now tested in CI.

[illwieckz]

The example1 CRN to DDS test doesn't work on macOS CI, I don't know why because I don't reproduce it on my end on macOS.

[illwieckz]

running: build/example1 c test/unvanquished_64.png -crn -out build/test/9/unvanquished_64.crn
example1 - Version v1.04 Built Jul  8 2024, 01:50:07
Loading source file: test/unvanquished_64.png
Source file size: 7471, Dimensions: 64x64
Actual Components: 4
Compressing to DXT5
Generating mipmaps using filter "kaiser"
Generated 6 mipmap levels in 0.004s
Compressing using quality level 128
Processing: 100%
Compressed to 2210 bytes, quality level: 128, effective bitrate: 3.237502
Writing CRN file: build/test/9/unvanquished_64.crn
running: build/example1 d build/test/9/unvanquished_64.crn -out build/test/9/unvanquished_64.dds
Loading source file: build/test/9/unvanquished_64.crn
Decompression mode only supports .dds or .crn files!
+ base64 build/test/9/unvanquished_64.crn
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

If I decode that file on my end and run crunch (even macOS crunch) on it, it says it's a valid crn file and decompresses it!

But it doesn't work in CI…

[illwieckz]

The example1 CRN to DDS test doesn't work on macOS CI, I don't know why because I don't reproduce it on my end on macOS.

Now fixed, a null-terminator was missing.

[illwieckz]

I don't know why the example1 test doesn't run on Windows MSVC Appveyor CI , while on my end a MinGW build runs correctly on wine.

[slipher]

I don't know why the example1 test doesn't run on Windows MSVC Appveyor CI , while on my end a MinGW build runs correctly on wine.

I reproduce a crash. It crashes when calling splitpath_s. I don't know what exactly was wrong, but anyway there is already a portable version file_utils::split_path. So example_platform files shouldn't be needed.

[illwieckz]

I don't know what exactly was wrong, but anyway there is already a portable version file_utils::split_path. So example_platform files shouldn't be needed.

It should be doable for example1 (I have a PoC that works in a branch), but that would be more problematic for example2 that is meant to be an example of how to not rely on crnlib:

example2

Shows how to transcodec CRN files to DDS using only
the functionality in inc/crn_decomp.h. It does not link against against
crnlib.lib or depend on it in any way. (Note: The complete source code,
approx. 4800 lines, to the CRN transcoder is included in inc/crn_decomp.h.)

[illwieckz]

So example1 and example3 now use crnlib for both split_path and strcpy_safe, but example2 uses custom code to not link against crnlib.

[illwieckz]

This also extends the testing by running cross-compiled executables when possible (using wine, qemu-user…).

[illwieckz]

To avoid some warnings related to strncpy I imported a copy (without asserts) of strcpy_safe from crn_strutils.cpp into example2.cpp (which is expected to not build against libcrn).

I also added two commits fixing two kind of warnings in examples.

[slipher]

LGTM