fastest logging

Replace the repeat_string function by a hard-coded tuple to avoid computation.
It allows up to 25 args in logging macros, easily extendable.

Jeremie can you give me a line of what's this before I merge?

So spdlog uses curly brackets {} as a place holder for the arguments to be logged.
In the previous version there is a function (run-time) that would replicate the brackets accordingly to the number of arguments. With this update, the repeated brackets are hard-coded and used at compile-time.
It simply avoids some unnecessary computation.

merged

mentioned in commit 866b9a03

mentioned in commit 0f0854af

mentioned in merge request !120 (merged)

Sorry jeremie, this MR did not compile. I reverted it. If new installations are needed, please document here.

Do you mind sending me the compilation error log ??

I sent it over slack

mentioned in commit f8abd429

mentioned in merge request !132 (merged)

mentioned in commit be60b873