Changed build options to use only WITH_XC_KEESHARE and
WITH_XC_KEESHARE_SECURE - WITH_XC_KEESHARE_INSECURE remains as internal
variable to highlight differences (may allow to build schemes later)
Message widget in KeeShare settings for groups is not closeable anymore
Fixed connection to renamed CustomData::customDataModified() signal
Fixed connection to renamed Database::databaseModified() signal
Fixed connection to renamed Group::groupModified() signal
* Add source folder keeshare for sharing with corresponding define WITH_XC_KEESHARE
* Move common crypto parts to src/crypto/ssh
* Extended OpenSSHKey
* Move filewatching to own file (currently in two related classes DelayedFileWatcher and BulkFileWatcher)
* Small improvements for style and code in several classes
* Sharing is secured using RSA-Keys which are generated on demand
* Publisher signs the container using their private key
* Client can verify the signed container and choose to decline an import,
import only once or trust the publisher and automatically import all
data of this source henceforth
* Integration of settings into Group-Settings, Database-Settings and Application-Settings
* Introduced dependency QuaZip as dependency to allow combined export of
key container and the (custom format) certificate
