split w6300 into its own static library to enforce layer isolation

w6300/CMakeLists.txt

@@ -0,0 +1,15 @@
+add_library(w6300 STATIC w6300.cpp)
+
+target_include_directories(w6300 PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
+
+target_compile_options(w6300 PRIVATE -Wall -Wextra -Wno-unused-parameter)
+
+target_link_libraries(w6300 PUBLIC
+    pico_stdlib
+    hardware_pio
+    hardware_spi
+    hardware_dma
+    hardware_clocks
+)
+
+pico_generate_pio_header(w6300 ${CMAKE_CURRENT_SOURCE_DIR}/qspi.pio)