Notification_Server: Added ability to choose position of notifications

The feature gives user ability to choose the position of notifications
out of Follow Deskbar, Lower Right, Lower Left, Upper Right and Upper
Left. Fixes #9749 - Notification_Server: add the ability to choose the
position of notifications (easy).

Signed-off-by: Adrien Destugues <pulkomandy@pulkomandy.tk>

Notifications: use a single settings file.

There were 3 setting files, each an archived BMessage. Now there is only
one with all the data inside.
* Rework the SettingsPane class to save and load settings from a
message, rather than having each panel pick a file path on its own
* Move saving the app filters to the preference app, rather than the
server (so it's done at the same place as other settings)
* Rework loading prefs in the server so the settings message is read
from the file once and all settings are loaded from it.

This turns out to be more changes than I anticipated.
Fixes #9424.

* revert '43157 as the files are actually needed. I still don't understand how I managed to build everything without them ...
* Move the files shared between server and preflet to the server folder.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@43159 a95241bf-73f2-0310-859d-f6bbb57e9c96

Notifications: use a single settings file.

There were 3 setting files, each an archived BMessage. Now there is only
one with all the data inside.
* Rework the SettingsPane class to save and load settings from a
message, rather than having each panel pick a file path on its own
* Move saving the app filters to the preference app, rather than the
server (so it's done at the same place as other settings)
* Rework loading prefs in the server so the settings message is read
from the file once and all settings are loaded from it.

This turns out to be more changes than I anticipated.
Fixes #9424.

* revert '43157 as the files are actually needed. I still don't understand how I managed to build everything without them ...
* Move the files shared between server and preflet to the server folder.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@43159 a95241bf-73f2-0310-859d-f6bbb57e9c96