Produce PDB for Windows builds

[ishitatsuyuki]

Makes life easier when there's a crash inside.

.. which I found out to be #66.

[ManlyMarco]

It seems like way too much (especially the log spam) to include in BE builds since those are often used by normal users, for better or for worse.
It's easy enough to clone the repo and make a debug build for testing when troubleshooting a crash. I might be wrong though.

[ishitatsuyuki]

If I'm understanding xmake correctly, set_symbols(debug) simply enables debug symbols; it doesn't change how the code is compiled. It shouldn't make any log spam.

The produced symbols is ~460KB, and I don't think this is at a size that people would complain. It's useful that you can symbolize crash dumps right away and without risking behavior change from building a different binary.

[arrowmaster]

On Linux and Mac, builds are run with mode.release and mode.debug. I think it would be better to change the Windows build script to also call xmake with mode.debug set instead adding set_symbols("debug") to all Windows builds.

The default behaviors from mode.release and mode.debug can be seen at https://github.com/xmake-io/xmake/blob/8bf5187281f1dcd3ea2f1cc41b1db5e9cf2cbc07/xmake/rules/mode/xmake.lua. Theres also a releasedbg which might be an option to consider.