Make colors customizable

We can print with colors to terminal
```
#define KCYN "\x1B[36m"
printf("%scyn\n", KCYN );
```
Could it be added to the library as an optional parameter to verbosity levels?
```
#define KCYN "\x1B[36m"
#define DETAILS 3
LOG_F(3, KCYN, "log DETAILS with cyan color");
LOG_F(3, "log DETAILS with default color");
```
It would make it easy to write a custom functions for colored output.
```
auto LOG_F3(string message) {
LOG_F(DETAILS, KCYN, message);
}
```
The code is just demonstration of how idea may look.