gadu: switch to libgadu 1.12.0

Signed-off-by: Rafał Malinowski <rafal.przemyslaw.malinowski@gmail.com>
gadu: use newest version of GG protocol

Signed-off-by: Rafał Malinowski <rafal.przemyslaw.malinowski@gmail.com>
gadu: use new gg_*_html methods to send text

Signed-off-by: Rafał Malinowski <rafal.przemyslaw.malinowski@gmail.com>
gadu: remove unused code

Signed-off-by: Rafał Malinowski <rafal.przemyslaw.malinowski@gmail.com>
gadu: send valid image tag to server

Signed-off-by: Rafał Malinowski <rafal.przemyslaw.malinowski@gmail.com>
gadu: new image sending mechanism - first try

Signed-off-by: Rafał Malinowski <rafal.przemyslaw.malinowski@gmail.com>
chat: replaced ChatImageKey with ChatImage

Signed-off-by: Rafał Malinowski <rafal.przemyslaw.malinowski@gmail.com>
gadu: remove unneeded files

Signed-off-by: Rafał Malinowski <rafal.przemyslaw.malinowski@gmail.com>
gadu: #2730 implemented: image sending is done using new version of protocol

Signed-off-by: Rafał Malinowski <rafal.przemyslaw.malinowski@gmail.com>