Adding new battle animations

This pull request contains changes related to animations. For testing purposes, the dialog class has been bypassed, and will be re-enabled when work needs to be done on it. Download the latest media files here: https://bitbucket.org/chessmasterhong/wateremblem-media/downloads#download-351686

**List of Additions**
* Added Archer normal hit animation
* Added Cavalier normal hit animation
* Added enemy Archer normal hit animation
* Added Fighter / Enemy Fighter normal hit animation
* Added General (Lance) / Enemy General (Lance) normal hit animation
* Added Knight (Lance) / Enemy Knight (Lance) normal hit animation
* Added Knight Lord / Enemy Knight Lord normal hit animation
* Added enemy Roy entity as well as normal hit animation.
* Added Monk / Enemy Monk normal hit animation.
* Added Paladin (Lance) / Enemy Paladin (Lance) normal hit animation.
* Added Pegasus Knight / Enemy Pegasus Knight normal hit animation.
* Added Sniper / Enemy Sniper normal hit animation. 
* Added Swordmaster / Enemy Sword Master normal hit animation.
* Added Thief / Enemy Thief Normal hit animation

**List of Removals**:
* The `Myrmidon` class will be eliminated from the game. The reason being is that I can not find his normal hit animation **anywhere**. 
* The `Berserker` class will be eliminated from the game, due to the fact that I can not find his normal hit animation **anywhere**.
* The `Dark Druid` class will be eliminated from the game, due to the fact that I can not find his normal hit animation **anywhere**. 

Even though we kept the `King` class, the animations above aren't worth having that much inconsistency in the game. 

**Notes**
* For the most part, almost all of the animations have been tested and placed properly.
* Many units can use different weapons after promoting. Unfortunately, that means having many more animation sheets, and I'm not sure how we would swap them out based on the equip weapon.

**Bugs**
* One of the most annoying things I cannot figure out is why some units seem to flip before their animation.
For example, take a look at the `pegasus knight` animation. Before she attacks, she flips her animation. I remember we had this problem before with some of the sprites, and somehow Kevin fixed them. Could you take a look at the `pegasus knight` animation and tell me if you can spot anything wrong with it? 

Other than that, everything is fine with the animations. 

Out of all the animations that are finished, only a few remain:

* Troubadour. (Won't be done, since we have no system for playing healing animations right now).
* Valkyrie. 
* Warrior.
* An updated Wyvern Knight animation.

**Future Updates**
Things to come in the future are:
* All the critical hit animations. 
* 1 ~ 2/3 maps.
* An updated text box background (I have a new image, I just haven't fixed it up yet.)
* Updated Weapon Equip System. This one is the lowest priority, since it should be the easiest. I'm mostly focusing on animations and game content first.