Moved and renamed files for consistent C code style (#463)

* **Documentation**
  * Added new C coding style guide detailing naming conventions for files, directories, macros, constants, variables, functions, and type definitions with illustrative examples.
  * Updated C++ coding style documentation with clarifications on C naming conventions and header directory organization patterns.

* **Refactor**
  * Updated header include paths throughout the codebase to use lowercase naming conventions consistently.

Tests/TactilityKernel/MutexTest.cpp

@@ -1,5 +1,5 @@
 #include "doctest.h"
-#include <Tactility/concurrent/Mutex.h>
+#include <tactility/concurrent/mutex.h>
 
 TEST_CASE("mutex_construct and mutex_destruct should properly set the handle") {
     Mutex mutex = { 0 };