Relicense a couple more files

Again, not wild about .license files, but it's kinda the only option :/.

See #1339 for further details. <3 everyone!

projects/common/src/main/java/dan200/computercraft/shared/details/ItemDetails.java

@@ -1,6 +1,6 @@
 // SPDX-FileCopyrightText: 2020 The CC: Tweaked Developers
 //
-// SPDX-License-Identifier: LicenseRef-CCPL
+// SPDX-License-Identifier: MPL-2.0
 
 package dan200.computercraft.shared.details;
 

projects/common/src/main/java/dan200/computercraft/shared/peripheral/speaker/SpeakerBlockEntity.java

@@ -1,6 +1,6 @@
 // SPDX-FileCopyrightText: 2017 The CC: Tweaked Developers
 //
-// SPDX-License-Identifier: LicenseRef-CCPL
+// SPDX-License-Identifier: MPL-2.0
 
 package dan200.computercraft.shared.peripheral.speaker;
 

projects/common/src/main/java/dan200/computercraft/shared/peripheral/speaker/SpeakerPeripheral.java

@@ -1,6 +1,6 @@
 // SPDX-FileCopyrightText: 2017 The CC: Tweaked Developers
 //
-// SPDX-License-Identifier: LicenseRef-CCPL
+// SPDX-License-Identifier: MPL-2.0
 
 package dan200.computercraft.shared.peripheral.speaker;
 

projects/common/src/main/java/dan200/computercraft/shared/pocket/peripherals/PocketSpeaker.java

@@ -1,6 +1,6 @@
 // SPDX-FileCopyrightText: 2017 The CC: Tweaked Developers
 //
-// SPDX-License-Identifier: LicenseRef-CCPL
+// SPDX-License-Identifier: MPL-2.0
 
 package dan200.computercraft.shared.pocket.peripherals;
 

projects/common/src/main/java/dan200/computercraft/shared/pocket/peripherals/PocketSpeakerPeripheral.java

@@ -1,6 +1,6 @@
 // SPDX-FileCopyrightText: 2017 The CC: Tweaked Developers
 //
-// SPDX-License-Identifier: LicenseRef-CCPL
+// SPDX-License-Identifier: MPL-2.0
 
 package dan200.computercraft.shared.pocket.peripherals;
 

projects/common/src/main/java/dan200/computercraft/shared/turtle/upgrades/TurtleSpeaker.java

@@ -1,6 +1,6 @@
 // SPDX-FileCopyrightText: 2017 The CC: Tweaked Developers
 //
-// SPDX-License-Identifier: LicenseRef-CCPL
+// SPDX-License-Identifier: MPL-2.0
 
 package dan200.computercraft.shared.turtle.upgrades;
 

projects/common/src/main/resources/assets/computercraft/textures/block/speaker_front.png.license

@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2023 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0

projects/common/src/main/resources/assets/computercraft/textures/block/speaker_side.png.license

@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2023 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0

projects/common/src/main/resources/assets/computercraft/textures/block/speaker_top.png.license

@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2023 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0

projects/common/src/main/resources/assets/computercraft/textures/block/turtle_speaker_face.png.license

@@ -0,0 +1,3 @@
+SPDX-FileCopyrightText: 2023 The CC: Tweaked Developers
+
+SPDX-License-Identifier: MPL-2.0

projects/core/src/test/resources/test-rom/spec/apis/paintutils_spec.lua

@@ -1,6 +1,6 @@
 -- SPDX-FileCopyrightText: 2019 The CC: Tweaked Developers
 --
--- SPDX-License-Identifier: LicenseRef-CCPL
+-- SPDX-License-Identifier: MPL-2.0
 
 local with_window = require "test_helpers".with_window