Allow skills to process player input when not locked on

[coolAlias]

Key (and mouse) releases are already passed to all skills whether locked on or not, but key (and mouse) presses are currently only processed while locked on.

[coolAlias]

This would be specifically to support skills added by other mods.

[coolAlias]

An additional method such as boolean SkillActive#requiresTarget() could streamline the key processing methods in DSSPlayerInfo so that individual skills don't need to check if currently locked on, e.g.:

@SideOnly(Side.CLIENT)
public boolean onKeyPressed(Minecraft mc, KeyBinding key) {
	for (SkillBase skill : skills.values()) {
		if ((!skill.requiresTarget() || this.isLockedOn()) 
			&& skill instanceof SkillActive 
			&& ((SkillActive) skill).isKeyListener(mc, key)
		) {
			if (((SkillActive) skill).keyPressed(mc, key, player)) {
				return true;
			}
		}
	}
	// etc.
	return false;
}

Alternatively, since the above might be too restrictive (e.g. it doesn't allow a skill that accepts input only when not locked on), the isLockedOn value or, even better, the current targeting skill could be passed to the isKeyListener function.