Fix Magic Bounce targets

[DizzyEggg]

This fixes #1774.

There were two issues present:

1. When Magic Bounce bounced a move hitting two targets(i.e Growl), it didn't always affect two targets. This was an easy fix adding
   bicword gHitMarker, HITMARKER_NO_ATTACKSTRING
   to the battle script.
2. When Magic Bounce bounced a move hitting two targets(i.e Growl), the original attacker would stop its move execution there. Simply put, attacker's Growl should affect both mons, one with Magic Bounce - gets bounced, and the other one. This was was a bit trickier to handle and I needed to create two additional fields in BattleStruct.

Here are the videos with edge cases covered.

[DizzyEggg]

Fixed conflicts.
Note: This also fixes an issue Lunos mentioned here #1771. That is, using a move which hits 3 targets(such as Surf) would not affect all of the possible targets.