his PR cleans up segment related code in main.c.
Also cleans up the linker a bit.

    Add memory pool to linker as .bss to validate that it exists properly.

    Move framebuffers, gfx, and audio buffers out of racing segment and make its own segment.

    Rename framebuffers.c to buffers.c as it contains more than just framebuffers.

    Import asserts from sm64 to validate that code segments are not overlapping

    Rename segNoload to segmentNoload

    Rename 802BA370 segment to trigTables

    Rename gMenuSelectionFromEndingSequence to gGotoMenu

    Rename gMenuSelectionFromQuit to gGotoMode

    Rename SEG_ENDING_SEQUENCES to SEG_ENDING

    Rename data_821D10 to ceremonyData

    Rename data_825800 to startupLogo

They match when placed there, although its not immediately clear
 that they truly belong there. But a match is a match.

Also cleaned up a bunch of .h files that had references to the
 newly matched variables.

Signed-off-by: Taggerung <tyler.taggerung@email.com>

* cleaning camera.h

* cleaning math_utils.h and remove space

* cleaning kart_dma

* cleaning menu.h

* Header cleanup

* Renames

* Some train decomp

* Move seg2 to ending/

* move racing code files into racing folder

* Fix progress

* Rename segments