`da_move` could lead to undesired side effects

[drocha87]

ded/src/common.h

Lines 37 to 43 in 57d23fa

	#define da_move(dst, src) \
	do { \
	free((dst)->items); \
	(dst)->items = (src).items; \
	(dst)->count = (src).count; \
	(dst)->capacity = (src).capacity; \
	} while (0)

I think that we should "clear" src after moving it to dst (setting (src).items = NULL; and zeroing its count and capacity).

Since src still holds a pointer to items it could cause undesired side effects.

[BillKek]

I think this is a C++ problem. And C is immune.