NWRAM & Direct Boot (#1149)

* SCFG_BIOS now selects between NDS and DSi BIOS
Allowing experimental direct boot.

* - making NWRAM Priorities work as in the HW
- fixed loading DSi stage2 Bootloader when in direct boot (should not be loaded) and might interfere with the image loaded into the (N)WRAM previously

* NWRAM and SCFG Registers are now write-guarded by the corresponding SCFG_EXT7/9 Bits

* removed debugging remainder

* Moved NDSHeader dependent SCFG initialization into the new DSi::SetupDirectBoot function called from NDS::SetupDirectBoot when ConsoleType is DSi

* removed redundant SCFG_BIOS bit checks

* Set of changes from RSDuck's review

* removed a forgotten comment

* - removed the guarded debug outputs for NWRAM
- NWRAM writes to bank and window registers now apply their write masks.
- added comment on an existing TODO within the code describing, why this is OK
- fixed initial NWRAM bank reset just accessing set A

* NWRAM not mapped to 03... range if bit25 in SCFG_EXT is cleared

* removed NWRAM write block on cleared bit25 in SCFG_EXT

* changed type of iterator for MapNWRAM_x functions from s8 to int

* - reduced calculations/comparisons on NWRAM write operations
- changed u8 to unsigned int for an iterator MapNWRAM_x

Co-authored-by: Tim Seidel <t.seidel@kts-systeme.de>

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