api: Add go files

I know this is a huge commit, but I can't be bothered to check
this in part by part.

api/owner.go

@@ -0,0 +1,13 @@
+package main
+
+import (
+	"time"
+)
+
+type owner struct {
+	OwnerHex       string    `json:"ownerHex"`
+	Email          string    `json:"email"`
+	Name           string    `json:"name"`
+	ConfirmedEmail bool      `json:"confirmedEmail"`
+	JoinDate       time.Time `json:"joinDate"`
+}