Update to boost 1.84.0

Update to boost 1.84.0 and start checking out boost as a submodule.

.github/workflows/build.yaml

@@ -1,24 +1,29 @@
 name: Build
-on: [push]
+on:
+  pull_request:
+  push:
+    branches: [main]
+    tags: ["v*"]
 jobs:
   build:
     strategy:
       matrix:
-        os: [windows-2022, macos-11, ubuntu-22.04]
-        addrsize: ["64"]
-        include:
-          - os: windows-2022
-            addrsize: "32"
+        os: [windows-large, macos-13-large, ubuntu-22.04]
     runs-on: ${{ matrix.os }}
     steps:
+      - name: Disable autocrlf
+        shell: bash
+        if: runner.os == 'Windows'
+        run: git config --global core.autocrlf input
+      - uses: actions/checkout@v4
+        with:
+          submodules: recursive
       - uses: secondlife/action-autobuild@v3
         with:
-          addrsize: ${{ matrix.addrsize }}
+          checkout: false
   release:
     needs: build
     runs-on: [ubuntu-latest]
     if: startsWith(github.ref, 'refs/tags/v')
     steps:
-      - uses: secondlife/action-autobuild-release@v1
-        with:
-          public: true
+      - uses: secondlife/action-autobuild-release@v3

.gitignore

@@ -1,4 +1 @@
-boost/bin.v2
-boost/stage
-boost/tools/build
-.DS_Store
+*.tar.bz2

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "boost"]
+	path = boost
+	url = https://github.com/boostorg/boost.git

LICENSE

@@ -0,0 +1,25 @@
+This repository contains a vendored version of Boost which maintains its own
+license and copyright information. See the contents of boost/ for more
+information.
+
+MIT License
+
+Copyright (c) 2024 Linden Research, Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.