refactor: remove 'build' from Target/Trace/Task file names

Lake/Build.lean

@@ -5,7 +5,7 @@ Authors: Gabriel Ebner, Sebastian Ullrich, Mac Malone
 -/
 import Lean.Data.Name
 import Lean.Elab.Import
-import Lake.BuildTarget
+import Lake.Target
 import Lake.BuildTop
 import Lake.Resolve
 import Lake.Package

Lake/BuildTargets.lean

@@ -4,7 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Mac Malone
 -/
 import Lake.Compile
-import Lake.BuildTarget
+import Lake.Target
 
 open System
 namespace Lake

Lake/Package.lean

@@ -7,7 +7,7 @@ import Lean.Data.Name
 import Lean.Elab.Import
 import Std.Data.HashMap
 import Lake.LeanVersion
-import Lake.BuildTarget
+import Lake.Target
 
 open Lean Std System
 

Lake/Target.lean

@@ -3,8 +3,8 @@ Copyright (c) 2021 Mac Malone. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Mac Malone
 -/
-import Lake.BuildTask
-import Lake.BuildTrace
+import Lake.Task
+import Lake.Trace
 
 open System
 namespace Lake