Add minimal release configuration.

- Update CMake configuration to build and test the library;
- Add Github CI scripts to run the tests on major platforms;
- Add gitignore file;
- Ensure that define statements invoking the library use namespace;
- Prevent using macros for aliased functions in fileSystem.h to ensure
  that they can be used with a namespace;
- Prevent ArchDemangle from stripping Pixar's namespace and update
  associated tests;
- Move testArchAbi.h and testArchUtil.h headers to the test directory and
  adjust corresponding include directives;
- Correct the library path in testArchAbi.cpp;
- Define PXR_VERSION as 2502.

.github/workflows/linux.yml

@@ -0,0 +1,42 @@
+name: test-linux
+
+on:
+  push:
+    branches: [ dev, main ]
+
+  # Run tests once a week on Sunday.
+  schedule:
+    - cron: "0 6 * * 0"
+
+permissions:
+  contents: read
+
+env:
+  CMAKE_BUILD_TYPE: Release
+  CMAKE_GENERATOR: Ninja
+  CTEST_OUTPUT_ON_FAILURE: True
+
+jobs:
+  test-linux:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Create Build Environment
+        run: |
+          sudo apt update
+          sudo apt install -y ninja-build
+          cmake -E make_directory ${{github.workspace}}/build
+
+      - name: Configure
+        working-directory: ${{github.workspace}}/build
+        run: cmake ..
+
+      - name: Build
+        working-directory: ${{github.workspace}}/build
+        run: cmake --build . --config Release
+
+      - name: Test
+        working-directory: ${{github.workspace}}/build
+        run: ctest -VV -C Release

.github/workflows/macos.yml

@@ -0,0 +1,41 @@
+name: test-macos
+
+on:
+  push:
+    branches: [ dev, main ]
+
+  # Run tests once a week on Sunday.
+  schedule:
+    - cron: "0 6 * * 0"
+
+permissions:
+  contents: read
+
+env:
+  CMAKE_BUILD_TYPE: Release
+  CMAKE_GENERATOR: Ninja
+  CTEST_OUTPUT_ON_FAILURE: True
+
+jobs:
+  test-macos:
+    runs-on: macos-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Create Build Environment
+        run: |
+          brew install ninja
+          cmake -E make_directory ${{github.workspace}}/build
+
+      - name: Configure
+        working-directory: ${{github.workspace}}/build
+        run: cmake ..
+
+      - name: Build
+        working-directory: ${{github.workspace}}/build
+        run: cmake --build . --config Release
+
+      - name: Test
+        working-directory: ${{github.workspace}}/build
+        run: ctest -VV -C Release

.github/workflows/windows.yml

@@ -0,0 +1,43 @@
+name: test-windows
+
+on:
+  push:
+    branches: [ dev, main ]
+
+  # Run tests once a week on Sunday.
+  schedule:
+    - cron: "0 6 * * 0"
+
+permissions:
+  contents: read
+
+env:
+  CMAKE_BUILD_TYPE: Release
+  CMAKE_GENERATOR: Visual Studio 17 2022
+  CMAKE_GENERATOR_PLATFORM: x64
+  CTEST_OUTPUT_ON_FAILURE: True
+
+  # Avoid the just-in-time debugger where possible when running tests.
+  ARCH_AVOID_JIT: True
+
+jobs:
+  test-windows:
+    runs-on: windows-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Create Build Environment
+        run: cmake -E make_directory ${{github.workspace}}/build
+
+      - name: Configure
+        working-directory: ${{github.workspace}}/build
+        run: cmake -D "ENABLE_PRECOMPILED_HEADERS=ON" ..
+
+      - name: Build
+        working-directory: ${{github.workspace}}/build
+        run: cmake --build . --config Release
+
+      - name: Test
+        working-directory: ${{github.workspace}}/build
+        run: ctest -VV -C Release

.gitignore

@@ -0,0 +1,57 @@
+# Prerequisites
+*.d
+
+# Compiled Object files
+*.slo
+*.lo
+*.o
+*.obj
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Compiled Dynamic libraries
+*.so
+*.dylib
+*.dll
+
+# Fortran module files
+*.mod
+*.smod
+
+# Compiled Static libraries
+*.lai
+*.la
+*.a
+*.lib
+
+# Executables
+*.exe
+*.out
+*.app
+
+# Cache
+Thumbs.db
+.DS_Store
+.AppleDouble
+
+# Development
+build/
+.vscode
+.project
+.settings
+.idea/
+.history/
+
+# CMake
+cmake-build-*/
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/