Make various updates and fixes:

- Add support for legacy CUDA versions; now compatible with CUDA 12.3 and newer
- Add support for NVRTC compilation
- Other fixes and code refactoring

build.sh

@@ -0,0 +1,12 @@
+# Change current directory into project root
+original_dir=$(pwd)
+script_dir=$(realpath "$(dirname "$0")")
+cd "$script_dir"
+
+# Remove old dist file, build files, and install
+rm -rf build dist
+rm -rf *.egg-info
+python setup.py bdist_wheel
+
+# Open users' original directory
+cd "$original_dir"