Rename core.c->mucurses.c; bin/core.o is too generic to belong to mucurses.

diff --git a/src/hci/mucurses/core.c b/src/hci/mucurses/mucurses.c
similarity index 100%
rename from src/hci/mucurses/core.c
rename to src/hci/mucurses/mucurses.c