Add new sword attacks

[Diarandor]

New sword attacks should be adquired as scrolls. Some may be hidden and not necessary to finish the game. Some will be similar to sword attacks in Teranigma, and they may be stronger than the normal sword attack.

This list (or the commands for each attack) may be modified later:

• Fast attack: sword, sword, sword.
• Dash forward attack: arrow, arrow, sword.
• Dash below attack: jump, and then: action + sword (keep action pressed and then use sword)
• Tornado attack: charge energy for spin attack, jump, then release the spin on the air. A tornado sprite will appear, pushing close enemies away (appart from a possible damage).

More features:

• Sword attacks on the air should only hurt flying/jumping enemies, and not enemies on the ground. And attacks on the ground should only hurt enemies on the ground, and not flying/jumping enemies. This feature will be useful to hurt normal enemies as well as some bosses.