tabs: rename setTabTextAndTooltipIfDiffer to updateTabTextAndTooltip

Signed-off-by: Rafał Malinowski <rafal.przemyslaw.malinowski@gmail.com>
tabs: refactor update-chat-title code

Signed-off-by: Rafał Malinowski <rafal.przemyslaw.malinowski@gmail.com>
tabs: #2726 fixed: occasionally invalid window title

Signed-off-by: Rafał Malinowski <rafal.przemyslaw.malinowski@gmail.com>
gadu: #2717 fixed: invalid < and > handling in received messages

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

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

Signed-off-by: Rafał Malinowski <rafal.przemyslaw.malinowski@gmail.com>
plugins: fixes for developer mode

Signed-off-by: Rafał Malinowski <rafal.przemyslaw.malinowski@gmail.com>
Revert "gadu: #2717 fixed: invalid < and > handling in received messages"

This reverts commit 2b1a0bad1d15fa2f5a3bcaa5b2515e5d76964209.
gadu: #2710 fixed: sending images works again

Signed-off-by: Rafał Malinowski <rafal.przemyslaw.malinowski@gmail.com>
message: fixed rendering messages with formatting

Signed-off-by: Rafał Malinowski <rafal.przemyslaw.malinowski@gmail.com>
gadu: #2717 fixed: invalid < and > handling in received messages

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