app: rename app implementation package

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/app/export_test.go

@@ -1,24 +0,0 @@
-package app
-
-import (
-	"git.gensokyo.uk/security/fortify/fst"
-	"git.gensokyo.uk/security/fortify/internal/sys"
-	"git.gensokyo.uk/security/fortify/sandbox"
-	"git.gensokyo.uk/security/fortify/system"
-)
-
-func NewWithID(id fst.ID, os sys.State) fst.App {
-	a := new(app)
-	a.id = newID(&id)
-	a.sys = os
-	return a
-}
-
-func AppIParams(a fst.App, sa fst.SealedApp) (*system.I, *sandbox.Params) {
-	v := a.(*app)
-	seal := sa.(*outcome)
-	if v.outcome != seal || v.id != seal.id {
-		panic("broken app/outcome link")
-	}
-	return seal.sys, seal.container
-}