format and split header and cpp file for rgbcx since it doesnt need to be single-file here

.clang-format

@@ -0,0 +1,6 @@
+---
+BasedOnStyle: LLVM
+IndentWidth: 4
+ColumnLimit: 160
+---
+

CMakeLists.txt

@@ -4,8 +4,14 @@ project(python_rgbcx)
 # Setup pybind
 add_subdirectory(extern/pybind11)
 
-# Make the pybind module
-pybind11_add_module(python_rgbcx src/main.cpp)
+# Make the python_rgbcx module
+add_library(python_rgbcx MODULE src/main.cpp src/rgbcx.cpp)
+
+# Link to Pybind
+target_link_libraries(python_rgbcx PRIVATE pybind11::module pybind11::lto)
+
+pybind11_extension(python_rgbcx)
+pybind11_strip(python_rgbcx)
 
 # Set module features, like C/C++ standards
 target_compile_features(python_rgbcx PUBLIC cxx_std_14 c_std_11)