Further licensing work

- Fix several inaccuracies with several files not marking Dan's
   authorship. Most of these are new files, where the code was moved from
   somewhere else:
   - In the public API:  IDynamicLuaObject, ILuaAPI, TaskCallbakc,
     IDynamicPeripheral, UpgradeBase
   - In the ROM: fs, http, require

 - Do not mark Dan as an author for entirely new code. This affects
   DetailHelpers, DropConsumer, FluidData, InventoryMethods, ItemDetails,
   MonitorRenderState, NoTermComputerScreen, Palette, PlatformHelperImpl,
   UploadFileMessage, the Terminal tests, and any speaker-related files.

 - Relicence many files under the MPL where we have permission to do
   so. See #1339 for further details.

Thank you to everyone who has contributed so far! Cannot overstate how
appreciated it is <3.

doc/events/computer_command.md

@@ -5,7 +5,7 @@ module: [kind=event] computer_command
 <!--
 SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
 
-SPDX-License-Identifier: LicenseRef-CCPL
+SPDX-License-Identifier: MPL-2.0
 -->
 
 The @{computer_command} event is fired when the `/computercraft queue` command is run for the current computer.

doc/events/redstone.md

@@ -5,7 +5,7 @@ module: [kind=event] redstone
 <!--
 SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
 
-SPDX-License-Identifier: LicenseRef-CCPL
+SPDX-License-Identifier: MPL-2.0
 -->
 
 The @{event!redstone} event is fired whenever any redstone inputs on the computer change.

doc/events/task_complete.md

@@ -6,7 +6,7 @@ see: commands.execAsync To run a command which fires a task_complete event.
 <!--
 SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
 
-SPDX-License-Identifier: LicenseRef-CCPL
+SPDX-License-Identifier: MPL-2.0
 -->
 
 The @{task_complete} event is fired when an asynchronous task completes. This is usually handled inside the function call that queued the task; however, functions such as @{commands.execAsync} return immediately so the user can wait for completion.

doc/events/term_resize.md

@@ -5,7 +5,7 @@ module: [kind=event] term_resize
 <!--
 SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
 
-SPDX-License-Identifier: LicenseRef-CCPL
+SPDX-License-Identifier: MPL-2.0
 -->
 
 The @{term_resize} event is fired when the main terminal is resized. For instance:

doc/events/terminate.md

@@ -5,7 +5,7 @@ module: [kind=event] terminate
 <!--
 SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
 
-SPDX-License-Identifier: LicenseRef-CCPL
+SPDX-License-Identifier: MPL-2.0
 -->
 
 The @{terminate} event is fired when <kbd>Ctrl-T</kbd> is held down.

doc/events/turtle_inventory.md

@@ -5,7 +5,7 @@ module: [kind=event] turtle_inventory
 <!--
 SPDX-FileCopyrightText: 2021 The CC: Tweaked Developers
 
-SPDX-License-Identifier: LicenseRef-CCPL
+SPDX-License-Identifier: MPL-2.0
 -->
 
 The @{turtle_inventory} event is fired when a turtle's inventory is changed.