Implement trainer battles and various changes

Implement trainer battles; add dialogue functionality; add random session seed for predictable random results; remove capitalization from text; add full party heal after every 10 waves

public/images/trainer/player.json

@@ -1,7 +1,7 @@
 {
 	"textures": [
 		{
-			"image": "rival_m.png",
+			"image": "player.png",
 			"format": "RGBA8888",
 			"size": {
 				"w": 196,

public/images/trainer/rival.json

@@ -1,7 +1,7 @@
 {
 	"textures": [
 		{
-			"image": "rival_f.png",
+			"image": "rival.png",
 			"format": "RGBA8888",
 			"size": {
 				"w": 267,