Move all cache to ~/.cache/gomuks

Now `rm -rf ~/.cache/gomuks` has the same effect as `/clearcache`

matrix/pushrules/rule.go

@@ -19,8 +19,14 @@ package pushrules
 import (
 	"maunium.net/go/gomuks/lib/glob"
 	"maunium.net/go/gomatrix"
+	"encoding/gob"
 )
 
+func init() {
+	gob.Register(PushRuleArray{})
+	gob.Register(PushRuleMap{})
+}
+
 type PushRuleCollection interface {
 	GetActions(room Room, event *gomatrix.Event) PushActionArray
 }