Rename Bonsai Viewer build option

Replace the old IFC viewer build switch with BUILD_BONSAIVIEWER in CMake, the Linux workflows, and the nix build script.

Generated with the assistance of an AI coding tool.

src/ifcviewer/CMakeLists.txt

@@ -76,6 +76,6 @@ install(FILES ${IFCVIEWER_H_FILES}
     DESTINATION ${INCLUDEDIR}/ifcviewer
 )
 
-if(BUILD_IFCVIEWER_TESTS)
+if(BUILD_BONSAIVIEWER_TESTS)
     add_subdirectory(tests)
 endif()

src/ifcviewer/README.md

@@ -143,7 +143,7 @@ mkdir build && cd build
 
 cmake ../cmake \
     -DCMAKE_BUILD_TYPE=Release \
-    -DBUILD_IFCVIEWER=ON \
+    -DBUILD_BONSAIVIEWER=ON \
     -DBUILD_CONVERT=OFF \
     -DBUILD_IFCPYTHON=OFF \
     -DBUILD_GEOMSERVER=OFF \