Renormalize line endings and enforce normalization for all contributors

.gitattributes

@@ -1,9 +1,9 @@
 
 # Custom attribute to mark source files using KiCad C++ formatting
-[attr]kicad-cpp-source whitepace=tab-in-indent format.clang-format-kicad
+[attr]kicad-cpp-source text=auto whitepace=tab-in-indent format.clang-format-kicad
 
 # Custom attribute to mark KiCad's own CMake files
-[attr]kicad-cmake-source whitespace=tab-in-indent
+[attr]kicad-cmake-source text=auto whitespace=tab-in-indent
 
 # Custom attribute for auto-generated sources:
 # * Do not perform whitespace checking
@@ -18,6 +18,7 @@
 
 *.cmake     kicad-cmake-source
 *.txt       kicad-cmake-source
+*.md        text=auto
 
 # Compiled bitmap sources
 bitmaps_png/cpp_*/*.cpp     generated