This PR places all LMMS symbols into namespaces to eliminate any potential future name collisions between LMMS and third-party modules.
Also, this PR changes back `LmmsCore` to `Engine`, reverting c519921306 .
Co-authored-by: allejok96 <allejok96@gmail.com>
* Moves mimeType from StringPairDrag to Clipboard
* Simplifies decodeKey and decodeValue methods
* Adds method to copy a string to clipboard
* Adds method to copy a string pair to the Clipboard
* Adds convenience methods to Clipboard.h to retrieve the QMimeData from the clipboard and checking whether a particular mime type format is present on it
* Uses only the TCOV copy/paste methods on the song editor
To keep consistency on the behavior of the TCOV copy and paste operations, we now only use the TCOV::copy() and TCOV::paste() methods for copying both individual and multiple TCOs.
* Removes obsolete TrackContentObject::cut() and merge copy() and paste() methods to single function TrackContentObject::copyStateTo()
* Adds Clipboard::getString method to get data for particular mime type
* Makes AutomatableModelView.cpp use the Clipboard class instead of calling Qt clipboard directly
