feat: add default logger

[qudix]

When SFSE::Init is used, it will now initialize a default spdlog logger.

SFSE::Init(a_sfse); // default log file will be automatically created

This behavior can be turned off by passing false as the optional second argument:

SFSE::Init(a_sfse, false); // default log file is disabled

...if you have no need for a log file at all. Keep in mind that this sets the default logger for the module (plugin), you can still modify it's behavior through the spdlog api, such as setting the level, or the pattern.

Some keen eyed may notice that I am also registering an msvc sink, this will not impact performance as spdlog as of a somewhat recent version now checks if a debugger is attached, and if not, the sink is essentially a no-op, with no real cost to performance.

You can test this pr with the xmake template by specifying the dev/qdx/logging branch.

[gottyduke]

Thank you for the addition, std::format is definitely worth switching to, considering that po3 also PR'd std::format counterpart when they added the FORM_TYPE formatter, so there's nothing stopping us from doing so.
fmt on the other hand, sometimes deliver aggresive updates and since we never pinned our dependency, this introduces incompatibilities with our setup, which had happened multiple times in the past, from CommonLibSSE and the recent 10.1 with /utf-8 change.