Accumulated changes. Update copyright year in anticipation of 2025. More PGRAPH stuff. Start working on guest CPU independent timer (RivaTimer) but not really tested or used yet. Add more docs

src/timer.c

@@ -4,6 +4,7 @@
 #include <wchar.h>
 #include <86box/86box.h>
 #include <86box/timer.h>
+#include <86Box/nv/vid_nv_rivatimer.h>
 
 uint64_t TIMER_USEC;
 uint32_t timer_target;
@@ -168,6 +169,9 @@ timer_init(void)
     timer_target = 0ULL;
     tsc          = 0;
 
+    /* Initialise the CPU-independent timer */
+    rivatimer_init();
+
     timer_inited = 1;
 }