changed how ImageButtonControl is rendered to put the image on top, and to support different styles for the image normal/depressed/highlighted. also changed imagebutton to use its own style,  rather than copy button automatically
changed how the image button looks to add a little padding around the edges, as well as adding styles for the various hotbar buttons
added a progress bar to show the player health
adjusted the CombatWeaponDialog's layout to match the structure used by other dialogs
misc sizing cleanups. i'm not sure what's up with the healthbar having to be 25px shorter than the parent. 50px would make sense. 0px would make sense. 25px does not.
changed constructor on abstract FusionGame to be protected