fst: rename from fipc

Signed-off-by: Ophestra Umiker <cat@ophivana.moe>

internal/app/id.go

@@ -1,17 +0,0 @@
-package app
-
-import (
-	"crypto/rand"
-	"encoding/hex"
-)
-
-type ID [16]byte
-
-func (a *ID) String() string {
-	return hex.EncodeToString(a[:])
-}
-
-func newAppID(id *ID) error {
-	_, err := rand.Read(id[:])
-	return err
-}