This adds some structures necessary to support multiple memory regions
in the future. It also adds support for different system memory types
and the new linear heap mapping at 0x30000000.

These helpers aren't really part of the kernel, and mem_map.cpp/h is
going to be moved there next.

This enables more dynamic management of the process address space,
compared to just directly configuring the page table for major areas.

This will serve as the foundation upon which the rest of the Kernel
memory management functions will be built.

memory.cpp/h contains definitions related to acessing memory and
configuring the address space
mem_map.cpp/h contains higher-level definitions related to configuring
the address space accoording to the kernel and allocating memory.

Also adds better documentation and removes the one-off reimplementation
of the function in pica.h.

Involves making asserts use printf instead of the log functions (log functions are asynchronous and, as such, the log won't be printed in time)
As such, the log type argument was removed (printf obviously can't use it, and it's made obsolete by the file and line printing)

Also removed some GEKKO cruft.

Got rid of I/O address's since the I/O addresses range's overlap with other
address's types such as vram, these I/O addresses need to be done in an different
way.

- Linear simply indicates that the mapped physical address is always MappedVAddr+0x0C000000, thus this memory can be used for hardware devices' DMA (such as the GPU).

- More readable, a little less error prone.

Conflicts:
	src/core/mem_map.h
	src/core/mem_map_funcs.cpp