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.

TactilityKernel/Source/drivers/gpio_controller.cpp

@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: Apache-2.0
+
+#include <tactility/driver.h>
+#include <tactility/drivers/gpio_controller.h>
+
+#define GPIO_DRIVER_API(driver) ((struct GpioControllerApi*)driver->api)
+
+extern "C" {
+
+error_t gpio_controller_set_level(Device* device, gpio_pin_t pin, bool high) {
+    const auto* driver = device_get_driver(device);
+    return GPIO_DRIVER_API(driver)->set_level(device, pin, high);
+}
+
+error_t gpio_controller_get_level(Device* device, gpio_pin_t pin, bool* high) {
+    const auto* driver = device_get_driver(device);
+    return GPIO_DRIVER_API(driver)->get_level(device, pin, high);
+}
+
+error_t gpio_controller_set_options(Device* device, gpio_pin_t pin, gpio_flags_t options) {
+    const auto* driver = device_get_driver(device);
+    return GPIO_DRIVER_API(driver)->set_options(device, pin, options);
+}
+
+error_t gpio_controller_get_options(Device* device, gpio_pin_t pin, gpio_flags_t* options) {
+    const auto* driver = device_get_driver(device);
+    return GPIO_DRIVER_API(driver)->get_options(device, pin, options);
+}
+
+}