cpukit, testsuite: Add rtems_printf and rtems_printer support.

This change adds rtems_printf and related functions and wraps the
RTEMS print plugin support into a user API. All references to the
plugin are removed and replaced with the rtems_printer interface.

Printk and related functions are made to return a valid number of
characters formatted and output.

The function attribute to check printf functions has been added
to rtems_printf and printk. No changes to remove warrnings are part
of this patch set.

The testsuite has been moved over to the rtems_printer. The testsuite
has a mix of rtems_printer access and direct print control via the
tmacros.h header file. The support for begink/endk has been removed
as it served no purpose and only confused the code base. The testsuite
has not been refactored to use rtems_printf. This is future work.

cpukit/sapi/include/rtems/profiling.h

@@ -25,6 +25,8 @@
 
 #include <stdint.h>
 
+#include <rtems/print.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif /* __cplusplus */
@@ -305,25 +307,11 @@ void rtems_profiling_iterate(
   void *visitor_arg
 );
 
-/**
- * @brief Function for formatted output.
- *
- * @param[in, out] arg Some argument.
- * @param[in] format The output format as specified by printf().
- * @param[in] ... More parameters according to format.
- *
- * @returns As specified by printf().
- *
- * @see rtems_profiling_report_xml().
- */
-typedef int (*rtems_profiling_printf)(void *arg, const char *format, ...);
-
 /**
  * @brief Reports profiling data as XML.
  *
  * @param[in] name The name of the profiling report.
- * @param[in] printf_func The formatted output function.
- * @param[in, out] printf_arg The formatted output function argument.
+ * @param[in] printer The RTEMS printer to send the output too.
  * @param[in] indentation_level The current indentation level.
  * @param[in] indentation The string used for indentation.
  *
@@ -331,8 +319,7 @@ typedef int (*rtems_profiling_printf)(void *arg, const char *format, ...);
  */
 int rtems_profiling_report_xml(
   const char *name,
-  rtems_profiling_printf printf_func,
-  void *printf_arg,
+  const rtems_printer *printer,
   uint32_t indentation_level,
   const char *indentation
 );