Project restructuring (fixes macOS builds) (#198)

- Create `Include/` folder for all main projects
- Fix some issues here and there (found while moving things)
- All includes are now in `Tactility/` subfolder and must be included with that prefix. This fixes issues with clashing POSIX headers (e.g. `<semaphore.h>` versus Tactility's `Semaphore.h`)

TactilityHeadless/Include/Tactility/hal/i2c/I2c.h

@@ -0,0 +1,56 @@
+#pragma once
+
+#include "./I2cCompat.h"
+
+#include <Tactility/RtosCompat.h>
+
+#include <climits>
+#include <string>
+#include <vector>
+
+namespace tt::hal::i2c {
+
+enum class InitMode {
+    ByTactility, // Tactility will initialize it in the correct bootup phase
+    ByExternal, // The device is already initialized and Tactility should assume it works
+    Disabled // Not initialized by default
+};
+
+struct Configuration {
+    std::string name;
+    /** The port to operate on */
+    i2c_port_t port;
+    /** Whether this bus should be initialized when device starts up */
+    InitMode initMode;
+    /** Whether this bus can stopped and re-started. */
+    bool canReinit;
+    /** Whether configuration can be changed. */
+    bool hasMutableConfiguration;
+    /** Configuration that must be valid when initAtBoot is set to true. */
+    i2c_config_t config;
+};
+
+enum class Status {
+    Started,
+    Stopped,
+    Unknown
+};
+
+bool init(const std::vector<i2c::Configuration>& configurations);
+
+bool start(i2c_port_t port);
+bool stop(i2c_port_t port);
+bool isStarted(i2c_port_t port);
+
+bool masterRead(i2c_port_t port, uint8_t address, uint8_t* data, size_t dataSize, TickType_t timeout);
+bool masterReadRegister(i2c_port_t port, uint8_t address, uint8_t reg, uint8_t* data, size_t dataSize, TickType_t timeout);
+bool masterWrite(i2c_port_t port, uint8_t address, const uint8_t* data, uint16_t dataSize, TickType_t timeout);
+bool masterWriteRegister(i2c_port_t port, uint8_t address, uint8_t reg, const uint8_t* data, uint16_t dataSize, TickType_t timeout);
+bool masterWriteRegisterArray(i2c_port_t port, uint8_t address, const uint8_t* data, uint16_t dataSize, TickType_t timeout);
+bool masterWriteRead(i2c_port_t port, uint8_t address, const uint8_t* writeData, size_t writeDataSize, uint8_t* readData, size_t readDataSize, TickType_t timeout);
+bool masterHasDeviceAtAddress(i2c_port_t port, uint8_t address, TickType_t timeout);
+
+bool lock(i2c_port_t port, TickType_t timeout = 10 / portTICK_PERIOD_MS);
+bool unlock(i2c_port_t port);
+
+} // namespace