Change various (confusing to user) message to be DEBUG only (#365)

cmake/pico_pre_load_toolchain.cmake

@@ -36,8 +36,8 @@ if (DEFINED PICO_COMPILER)
                 select one from \"cmake/toolchains\" folder.")
         endif ()
     endif ()
+    message("PICO compiler is ${PICO_COMPILER}")
 endif ()
 
-message("PICO compiler is ${PICO_COMPILER}")
 unset(PICO_COMPILER CACHE)
 

docs/CMakeLists.txt

@@ -1,4 +1,4 @@
-find_package(Doxygen)
+find_package(Doxygen QUIET)
 if (PICO_SDK_TOP_LEVEL_PROJECT AND ${DOXYGEN_FOUND})
     set(PICO_BUILD_DOCS_DEFAULT 1)
 endif()

tools/FindELF2UF2.cmake

@@ -22,7 +22,7 @@ if (NOT ELF2UF2_FOUND)
     set(ELF2UF2_TARGET ELF2UF2)
 
     if (NOT TARGET ${ELF2UF2_BUILD_TARGET})
-        message("ELF2UF2 will need to be built")
+        message(DEBUG "ELF2UF2 will need to be built")
         ExternalProject_Add(${ELF2UF2_BUILD_TARGET}
                 PREFIX elf2uf2 SOURCE_DIR ${ELF2UF2_SOURCE_DIR}
                 BINARY_DIR ${ELF2UF2_BINARY_DIR}

tools/FindPioasm.cmake

@@ -22,7 +22,7 @@ if (NOT Pioasm_FOUND)
     set(Pioasm_TARGET Pioasm)
 
     if (NOT TARGET ${PioasmBuild_TARGET})
-        message("PIOASM will need to be built")
+        message(DEBUG "PIOASM will need to be built")
 #        message("Adding external project ${PioasmBuild_Target} in ${CMAKE_CURRENT_LIST_DIR}}")
         ExternalProject_Add(${PioasmBuild_TARGET}
                 PREFIX pioasm SOURCE_DIR ${PIOASM_SOURCE_DIR}