Yet another libultra cleanup (#1384)

* os symbols

* various variables

* more variables

* more cleanup

* yeet HW_REG

* OS_PHYSICAL_TO_K0 and other cleanups

* Rename r4300.h

* migrate pimgr data and cleanup on initialize.c

* rename osFlash symbols

* cleanup gu

* vimodes

* yeet rmon, do libc files

* some os files

* hardwareinterrupt

* cleanup a lot of os files

* cleanup osVirtualToPhysical

* various io files

* another io chunk

* final io chunk

* yeet hardware.h

* yeet PHYSICAL_TO_VIRTUAL and VIRTUAL_TO_PHYSICAL

* fix typo

* fix merge

* remove global.h from libultra files

* fixes and format

* brief explanation

* review

* review

* review

* review

* SEGMENTED_TO_K0

* Revert "SEGMENTED_TO_K0"

This reverts commit f8d62d670f.

* take two

* bss

* bss

src/code/z_lib.c

@@ -699,14 +699,14 @@ void Lib_Nop801004FC(void) {
 }
 
 void* Lib_SegmentedToVirtual(void* ptr) {
-    return SEGMENTED_TO_VIRTUAL(ptr);
+    return SEGMENTED_TO_K0(ptr);
 }
 
 void* Lib_SegmentedToVirtualNull(void* ptr) {
     if (((uintptr_t)ptr >> 28) == 0) {
         return ptr;
     } else {
-        return SEGMENTED_TO_VIRTUAL(ptr);
+        return SEGMENTED_TO_K0(ptr);
     }
 }
 
@@ -719,7 +719,7 @@ void* Lib_VirtualToPhysical(void* ptr) {
     if (ptr == NULL) {
         return NULL;
     } else {
-        return (void*)VIRTUAL_TO_PHYSICAL(ptr);
+        return (void*)OS_K0_TO_PHYSICAL(ptr);
     }
 }
 
@@ -732,6 +732,6 @@ void* Lib_PhysicalToVirtual(void* ptr) {
     if (ptr == NULL) {
         return NULL;
     } else {
-        return (void*)PHYSICAL_TO_VIRTUAL(ptr);
+        return OS_PHYSICAL_TO_K0(ptr);
     }
 }