- Fix build for Leap 15.2

- Fix CPPFLAGS to use current versions.
- Fix the source URL.

- try to fix crazy deps explosion by packaging libpragha.so in main
pragha package
- do not package plugins again in plugins-devel package

- Update to 1.3.99.1 (1.4 RC)
* Shows temporary messages or services errors such as
in-app-notifications.
* Replace the status bar with a floating bar that does not require
so much space.
* Huge refactoring of the mtp plugin. Everything runs in
a second thread.
* Split Pragha between the application and a library to link
the plugins.
* Add proxy setting to song-info plugin.
* Introduce PraghaTempProvider but not used yet.
* Move background tasks popover to main toolbar.
* Strip accentuation and others characters when approximate search.
Issue #146
* Send notification when finished ampache or koel import
* Use popovers in the menus of sidebars.
* Improve metadata for appstream. Issue #152
* Adjust copyright mentioning Consonance.
* Convert the status bar to an floating bar.
* Implement upgrade Koel and Ampache from library pane menu.
* Ampache: Reports when the server is empty.