Adding a bunch of animation sheets

This pull request contains a bunch of resources for animation sheets. The following have been included:

* Female Mage (Basic Unit) animation sheet.
* Female Sage (Advanced Unit) animation sheet.
* Valkyrie (Advanced Unit) animation sheet.
* Wyvern Knight (Basic Unit) animation sheet.
* Wyvern Lord (Advanced Unit) animation sheet.
* Archsage (Advanced Unit) animation sheet.
* Pegasus Knight (Basic Unit) animation sheet.
* Dark Druid (Advanced Unit) animation sheet.
* Queen (Could be an ally character) animation sheet. 

More spritesheets to come in the near future. For now, a break. 
Note: Cool character stat screen to come in the next pull request.