More RAM!

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Gordon
So... STM32F103RC chips (as used in Espruino) are supposed to have 48kB of RAM.

However, I just tried this:
```
>peek32(0x20000000+(64*1024)-4)  
=2549694936
>poke32(0x20000000+(64*1024)-4,0)   
=undefined
>peek32(0x20000000+(64*1024)-4)  
=0
```
It kind of implies that there's more RAM there than you'd expect. On my chip, using a value higher than 64 crashes it, so it looks like there's 64kB.

I guess it's not unexpected - processor manufacturers don't use different dies for different processors. It's cool though - after I tried to get RD chips and couldn't, it looks like that's what we have anyway - they've just got RC stamped on the top!

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