AP_HAL: make timed processes take void *argument

this allows the class to be passed in, meaning that drivers that use
register_timer_process() and register_io_process() don't need to use
static members. That results in simpler, easier to read code

libraries/AP_HAL/AP_HAL_Namespace.h

@@ -34,7 +34,7 @@ namespace AP_HAL {
 
     /* Typdefs for function pointers (Procedure, Timed Procedure) */
     typedef void(*Proc)(void);
-    typedef void(*TimedProc)(uint32_t);
+    typedef void(*TimedProc)(void *);
 
     /**
      * Global names for all of the existing SPI devices on all platforms.

libraries/AP_HAL/Scheduler.h

@@ -16,13 +16,13 @@ public:
     virtual uint32_t micros() = 0;
     virtual void     delay_microseconds(uint16_t us) = 0;
     virtual void     register_delay_callback(AP_HAL::Proc,
-                        uint16_t min_time_ms) = 0;
+                                             uint16_t min_time_ms) = 0;
 
     // register a high priority timer task
-    virtual void     register_timer_process(AP_HAL::TimedProc) = 0;
+    virtual void     register_timer_process(AP_HAL::TimedProc, void *) = 0;
 
     // register a low priority IO task
-    virtual void     register_io_process(AP_HAL::TimedProc) = 0;
+    virtual void     register_io_process(AP_HAL::TimedProc, void *) = 0;
 
     // suspend and resume both timer and IO processes
     virtual void     suspend_timer_procs() = 0;
@@ -31,7 +31,7 @@ public:
     virtual bool     in_timerprocess() = 0;
     
     virtual void     register_timer_failsafe(AP_HAL::TimedProc,
-                        uint32_t period_us) = 0;
+                                             uint32_t period_us) = 0;
 
     virtual bool     system_initializing() = 0;
     virtual void     system_initialized() = 0;