#10 Add ability to output log with custom functions (for sxhub_t)

[Alexander Vdolainen]

Add ability to output logs (warnings and error messages) with a custom functions.
It should be done for sxhub_t i.e.

sxhub_set_logops(sxhub_t *, int (*log)(sxlogtype_t, fmt, ...));

typedef enum {
  SXCRITICAL_LOG = 0,
  SXERROR_LOG,
  SXWARNING_LOG,
  SXINFO_LOG,
  SXDEBUG_LOG,
} sxlogtype_t;

Find the places with frpintf(stderr, and change it.

[Alexander Vdolainen]

https://sourceforge.net/u/leonid-ed/ done this.
many thanks,

[Leonid Edrenkin]

I've made a merge request.

[Alexander Vdolainen]

Many thanks!
hope for the new requests :)