More compatibility updates

[pwm1234]

Thanks for fixing the problems with 1.y.z. Your changes were much better than mine!

In this PR I added a config setting for the rotate_on_open argument to the spdlog rotating file sink constructor with commit gabime/spdlog@2463fe9
I also updated the version check in CMakeLists.txt from 0.14.0 to 1.0.0.

Finally I added a call to spdlog::set_pattern if global_pattern was set. (This is not really a compatibility change, but I think it is more correct to have this logic in that to leave it out.)

Thanks again for your help!

[pwm1234]

Sorry, I believe this PR is premature. It is based on a spdlog commit that was after that most recent 1.3.1 spdlog release. I can either add a version check to it, or we can just wait until 1.3.2 is out.

[guangie88]

Thanks for the PR, this would be good to be put into the repo once spdlog v1.3.2 includes it in, but I might be concern about the backward compatibility with <= v1.3.1 since this breaks the function call. It would most likely have to be wrapped in macro to cater to both sides.