Replace allLVGL driver I2C code with I2C Manager

For discussion see #70

i2c_manager/i2c_manager.h

@@ -0,0 +1,76 @@
+#ifndef _I2C_MANAGER_H
+#define _I2C_MANAGER_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/*
+
+    If you copy the i2c_manager files to your own component instead of
+    depending on i2c_manager, you MUST uncomment the define below
+    and put in some short string that identifies your component (such
+    as 'xyz'). This will cause i2c_manager to create functions named
+    xyz_i2c_* instead of i2c_manager_*. See README.md for details.
+
+*/
+
+#define I2C_OEM lvgl
+
+
+// Only here to get the I2C_NUM_0 and I2C_NUM_1 defines.
+#include <driver/i2c.h>
+
+#define CONCATX(A, B) A ## B
+#define CONCAT(A, B) CONCATX(A, B)
+#define STR_LITERAL(s) # s
+#define STR_EXPAND(s) STR_LITERAL(s)
+#define STR_QUOTE(s) STR_EXPAND(STR_EXPAND(s))
+
+#ifdef I2C_OEM
+    #define I2C_NAME_PREFIX CONCAT(I2C_OEM, _i2c)
+#else
+    #define I2C_NAME_PREFIX i2c_manager
+#endif
+#define I2C_TAG STR_EXPAND(I2C_NAME_PREFIX)
+
+#define I2C_FN(s) CONCAT(I2C_NAME_PREFIX, s)
+
+
+#define I2C_ADDR_10 ( 1 << 15 )
+#define I2C_REG_16  ( 1 << 31 )
+#define I2C_NO_REG  ( 1 << 30 )
+
+esp_err_t I2C_FN(_init)(i2c_port_t port);
+esp_err_t I2C_FN(_read)(i2c_port_t port, uint16_t addr, uint32_t reg, uint8_t *buffer, uint16_t size);
+esp_err_t I2C_FN(_write)(i2c_port_t port, uint16_t addr, uint32_t reg, const uint8_t *buffer, uint16_t size);
+esp_err_t I2C_FN(_close)(i2c_port_t port);
+esp_err_t I2C_FN(_lock)(i2c_port_t port);
+esp_err_t I2C_FN(_unlock)(i2c_port_t port);
+esp_err_t I2C_FN(_force_unlock)(i2c_port_t port);
+
+
+#ifdef I2C_OEM
+
+    void I2C_FN(_locking)(void* leader);
+
+#else
+
+    void* i2c_manager_locking();
+
+    typedef struct {
+        int32_t (* read)(void *handle, uint8_t address, uint8_t reg, uint8_t *buffer, uint16_t size);
+        int32_t (* write)(void *handle, uint8_t address, uint8_t reg, const uint8_t *buffer, uint16_t size);
+        void *handle;
+    } i2c_hal_t;
+
+    void* i2c_hal(i2c_port_t port);
+
+#endif
+
+
+#ifdef __cplusplus
+}
+#endif
+#endif