Implement saving+loading the game

Implement ToJSON and FromJSON for all of the various pieces of the game
state, and add a pair of functions saveGame/loadGame implementing a
prism to save the game as zlib-compressed JSON. To test this, there's
now Arbitrary, CoArbitrary, and Function instances for all the parts of
the game state - to get around circular imports with the concrete
entities this unfortunately is happening via orphan instances, plus an
hs-boot file to break a circular import that was just a little too hard
to remove by moving things around. Ugh.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/Xanthous/AI/Gormlak.hs-boot b/src/Xanthous/AI/Gormlak.hs-boot
new file mode 100644
index 000000000000..391a8a807f8c
--- /dev/null
+++ b/src/Xanthous/AI/Gormlak.hs-boot
@@ -0,0 +1,7 @@
+{-# OPTIONS_GHC -fno-warn-orphans #-}
+module Xanthous.AI.Gormlak where
+
+import Xanthous.Entities
+import Xanthous.Entities.Creature
+
+instance Entity Creature