Implement register mirroring

[Rosalie241]

This patch is based on the ares PR which implements the same thing: ares-emulator/ares#1344

We also sadly still need bounds checking for some register read/writes.

This also adds a bounds check for RDRAM register read/writes, which, according to n64brew, reads 0 when out-of-bounds:
https://n64brew.dev/wiki/RDRAM#RDRAM_registers

It also mentions the following:

RDRAM registers mirror every 0x40 bytes (16 words). Register numbers 10 to 15 all produce 0 when read. Above 0x200 (register number 128) the Device Type mirrors are replaced with the Row register.

I don't think any game relies on that so that's a TODO for the future.