timer.h: remove some obsolete stuff, replace char with uint8_t.

No functional change.

timer.c

@@ -130,7 +130,7 @@ void timer_init() {
 	as late as possible. If you use it from outside the step interrupt,
 	do a sei() after it to make the interrupt actually fire.
 */
-char timer_set(int32_t delay, char check_short) {
+uint8_t timer_set(int32_t delay, uint8_t check_short) {
 	uint16_t step_start = 0;
 	#ifdef ACCELERATION_TEMPORAL
 	uint16_t current_time;

timer.h

@@ -2,10 +2,6 @@
 #define	_TIMER_H
 
 #include	<stdint.h>
-#ifdef __AVR__
-#include	<avr/io.h>
-#endif
-#include "simulator.h"
 
 
 // time-related constants
@@ -21,12 +17,9 @@
 #define TICK_TIME_MS (TICK_TIME / (F_CPU / 1000))
 
 
-/*
-timer stuff
-*/
-void timer_init(void) __attribute__ ((cold));
+void timer_init(void);
 
-char timer_set(int32_t delay, char check_short);
+uint8_t timer_set(int32_t delay, uint8_t check_short);
 
 void timer_stop(void);