Renaming all cura-extra-plugin* packages

.. into cura-plugin* packages. In theory there is no reason why a plugin shouldn't be allowed to go into the main repository, called Cura.
Therefore we should care about this and prevent any future conflicts between packages.
Recently this situation was hit, when UM3NPP plugin has been moved into Cura.

Cura-extra-plugins/control

@@ -7,12 +7,13 @@ Build-Depends:
  python3-all-dev
 Standards-Version: 3.9.6
 
-Package: cura-extra-plugins-all
+Package: cura-plugins-all-extra
+Provides: cura-extra-plugins-all
 Architecture: all
 Depends:
- cura-extra-plugin-octoprint,
- cura-extra-plugin-orientation,
- cura-extra-plugin-postprocessing,
+ cura-plugin-octoprint,
+ cura-plugin-orientation,
+ cura-plugin-postprocessing,
 # Incompatible API:
 # cura-extra-plugin-doodle3d,
 Provides:
@@ -22,11 +23,12 @@ Enhances:
 Description: Cura plugin meta-package
  .
 
-Package: cura-extra-plugins-all-dev
+Package: cura-plugins-all-extra-dev
+Provides: cura-extra-plugins-all-dev
 Architecture: all
 Depends:
- cura-extra-plugin-godmode,
- cura-extra-plugin-dbusinterface,
+ cura-plugin-godmode,
+ cura-plugin-dbusinterface,
 Provides:
  cura-extra-plugins
 Enhances:
@@ -34,7 +36,8 @@ Enhances:
 Description: Cura plugin meta-package
  .
 
-Package: cura-extra-plugin-godmode
+Package: cura-plugin-godmode
+Provides: cura-extra-plugin-godmode
 Architecture: all
 Depends:
  cura-plugin-api-3,
@@ -42,7 +45,8 @@ Depends:
 Description: Cura plugin - GodMode
  For more info see: https://github.com/sedwards2009/cura-god-mode-plugin
 
-Package: cura-extra-plugin-dbusinterface
+Package: cura-plugin-dbusinterface
+Provides: cura-extra-plugin-dbusinterface
 Architecture: all
 Depends:
  cura-plugin-api-3,
@@ -50,7 +54,8 @@ Depends:
 Description: Cura plugin - DBusInterface
  For more info see: https://github.com/awhiemstra/cura-dbusinterface
 
-Package: cura-extra-plugin-doodle3d
+Package: cura-plugin-doodle3d
+Provides: cura-extra-plugin-doodle3d
 Architecture: all
 Depends:
  cura-plugin-api-2,
@@ -58,7 +63,8 @@ Depends:
 Description: Cura plugin - Doodle3D
  .
 
-Package: cura-extra-plugin-postprocessing
+Package: cura-plugin-postprocessing
+Provides: cura-extra-plugin-postprocessing
 Architecture: all
 Depends:
  cura-plugin-api-3,
@@ -66,7 +72,8 @@ Depends:
 Description: Cura plugin - PostProcessing
  For more info see: https://github.com/nallath/PostProcessingPlugin
 
-Package: cura-extra-plugin-octoprint
+Package: cura-plugin-octoprint
+Provides: cura-extra-plugin-octoprint
 Architecture: all
 Depends:
  cura-plugin-api-3,
@@ -75,7 +82,8 @@ Depends:
 Description: Cura plugin - OctoPrint
  For more info see: https://github.com/fieldOfView/OctoPrintPlugin
 
-Package: cura-extra-plugin-orientation
+Package: cura-plugin-orientation
+Provides: cura-extra-plugin-orientation
 Architecture: all
 Depends:
  cura-plugin-api-3,