Update tox.h with constant functions.

These are now generated by apidsl.

toxcore/tox.h

@@ -232,11 +232,15 @@ bool tox_version_is_compatible(uint32_t major, uint32_t minor, uint32_t patch);
  */
 #define TOX_PUBLIC_KEY_SIZE            32
 
+uint32_t tox_public_key_size(void);
+
 /**
  * The size of a Tox Secret Key in bytes.
  */
 #define TOX_SECRET_KEY_SIZE            32
 
+uint32_t tox_secret_key_size(void);
+
 /**
  * The size of a Tox address in bytes. Tox addresses are in the format
  * [Public Key (TOX_PUBLIC_KEY_SIZE bytes)][nospam (4 bytes)][checksum (2 bytes)].
@@ -247,46 +251,64 @@ bool tox_version_is_compatible(uint32_t major, uint32_t minor, uint32_t patch);
  */
 #define TOX_ADDRESS_SIZE               (TOX_PUBLIC_KEY_SIZE + sizeof(uint32_t) + sizeof(uint16_t))
 
+uint32_t tox_address_size(void);
+
 /**
  * Maximum length of a nickname in bytes.
  */
 #define TOX_MAX_NAME_LENGTH            128
 
+uint32_t tox_max_name_length(void);
+
 /**
  * Maximum length of a status message in bytes.
  */
 #define TOX_MAX_STATUS_MESSAGE_LENGTH  1007
 
+uint32_t tox_max_status_message_length(void);
+
 /**
  * Maximum length of a friend request message in bytes.
  */
 #define TOX_MAX_FRIEND_REQUEST_LENGTH  1016
 
+uint32_t tox_max_friend_request_length(void);
+
 /**
  * Maximum length of a single message after which it should be split.
  */
 #define TOX_MAX_MESSAGE_LENGTH         1372
 
+uint32_t tox_max_message_length(void);
+
 /**
  * Maximum size of custom packets. TODO: should be LENGTH?
  */
 #define TOX_MAX_CUSTOM_PACKET_SIZE     1373
 
+uint32_t tox_max_custom_packet_size(void);
+
 /**
  * The number of bytes in a hash generated by tox_hash.
  */
 #define TOX_HASH_LENGTH                32
 
+uint32_t tox_hash_length(void);
+
 /**
  * The number of bytes in a file id.
  */
 #define TOX_FILE_ID_LENGTH             32
 
+uint32_t tox_file_id_length(void);
+
 /**
  * Maximum file name length for file transfers.
  */
 #define TOX_MAX_FILENAME_LENGTH        255
 
+uint32_t tox_max_filename_length(void);
+
 
 /*******************************************************************************
  *