Use intptr in most remaining code files (#1438)

* Use intptr in most remaining code files

* Fix missing uintptr_t in actor

* Use u8* casts for texture pointer arithmetic

* Use bg + 1 instead of casting in Room_DrawBackground2D

src/code/z_jpeg.c

@@ -102,7 +102,7 @@ void Jpeg_CopyToZbuffer(u16* src, u16* zbuffer, s32 x, s32 y) {
  * unaligned values in JPEG header files.
  */
 u16 Jpeg_GetUnalignedU16(u8* ptr) {
-    if (((u32)ptr & 1) == 0) {
+    if (((uintptr_t)ptr & 1) == 0) {
         // Read the value normally if it's aligned to a 16-bit address.
         return *(u16*)ptr;
     } else {