Bugfixes to OS_Bytes 13 and 14.
Detail: Event numbers greater than 31 are possible, it's just that OS_GenerateEvent doesn't bother cheking the event semaphores for them. However, the value returned in R1 from these OS_Bytes always indicated that such events were disabled. This suggests that OS_GenerateEvent was not always so, but the initials in comments there suggest the change was about RISC OS 3.0. The OS_Bytes now correctly reflect OS_GenerateEvent behaviour. Another bug fix is that once the event semaphores had saturated at 255, OS_Byte 13 was still happy to decrement the semaphore, so for example 256 enables followed by 255 disables would have disabled the event. Admin: Not tested. Version 5.35, 126.96.36.199. Tagged as 'Kernel-5_35-4_79_2_70'
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