Add client versions between 1.0.0 and 1.2.5

[Pixaurora]

This does not include the latest commit's changes where many stat-related mixins were removed in favor of hooking directly into when stats get changed instead, but adds support for all other changes. I hope you like it!!

[LostLuma]

In your changeset statistics involving blocks / items were never initiated, because stats were initialized at the start of the program instead of when the Minecraft class is created (even though this is correct in the existing 1.3+ code). I fixed this in addition to pulling in the upstream changes:

@Mixin(Minecraft.class)
public class MinecraftMixin {
-   @Inject(method = "main", at = @At("HEAD"))
-   private static void onMain(CallbackInfo callbackInfo) {
+   @Inject(method = "<init>", at = @At("TAIL"))
+   private void onInit(CallbackInfo callbackInfo) {
        Stats.init();
    }