Change name to wd74b about pokered HOT 3 CLOSED

While it is true that it would be better to have a more descriptive name than wd74b, only bit 5 of that byte determines if the player has the Pokedex. This address is more generally a game progress flag, meaning each bit is a flag for a different game event.

In order to clean this up, I am considering changing wram.asm to something like:

wFlags_d74b:: ds 1
[...]
POKEDEX_OWNED EQU 5

This way, code can check if the player has the Pokedex by using:

ld a, [wFlags_d74b]
bit POKEDEX_OWNED, a

from pokered.

this flag looks like it was enumerated along with a host of others. for example

constants/event_flags.asm

check_flag: macro
    ld a, [wEventFlags + flag_\1 / 8]
    bit flag_\1 % 8, a
endm

flag: macro
    enum flag_\1
endm

__enum__ = 0
    flag 0
    flag 1
    flag 2
    ...
    flag pokedex
    ...
NUM_EVENT_FLAGS equ __enum__

wram.asm

wEventFlags:
    flag_array NUM_EVENT_FLAGS

then

    check_flag pokedex

from pokered.

Handled by #107

from pokered.