use .IsSet() instead if .Get() != NULL

Change-Id: Ia2b7a719fd398e78cc3b11d4f7b02cb81179f65f
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3488
Reviewed-by: Jérôme Duval <jerome.duval@gmail.com>

app_server memory management: use ObjectDeleter to mark ownership

Make object ownership explicit by use of ObjectDeleter where possible.

Change-Id: I499a00aa3390d1510ae284419e73faffa5166430
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2695
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>

app_server: fix transformations in BPicture

Fixes #16122, #16147.

Change-Id: Iee7aa8a2325d34a526578a58507ea3690459c8d7
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2898
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

RemoteDrawingEngine: Reduce RP_READ_BITMAP result timeout.

RemoteDrawingEngine: Whitespace cleanup and a simplification.

Remote{Message|DrawingEngine}: Add some more debug output.

RemoteDrawingEngine: Implement StringWidth.

It doesn't actually seem to be called though.

RemoteDrawingEngine: Fix position of gradient in FillShape.

It wasn't added at the end.

RemoteDesktop: Implement support for BAffineTransform.

It is currently somewhat broken client side though.

RemoteDesktop: Switch connection direction and simplify client.

Instead of the server connecting back to a listening client, make it
into a more traditional setup with the server listening on a port and
the client connecting to it.

The client can now either connect directly, unencrypted and without the
ability to trigger listening and specifying a command, or through SSH,
as before with the possibilty to run a target application and causing
the creation of the listener.

With the direction change, there's only the need for one, local, port
forward with SSH, which simplifies things.

servers/app: html5/remote drawing 64-bit fixes

* Still doesn't seem to work anymore.
* Documentation: TARGET_SCREEN="html5:127.0.0.1:80" DeskCalc

Fix called C++ object pointer is null

Signed-off-by: Jérôme Duval <jerome.duval@gmail.com>

AppServer: Organize "HWInterface" classes

* Organize interface classes into directories
* Long term this will assist in the multi-head
interface / accelerant changes.
* local draws to the local hw accelerant
* remote draws to a remote connection (???)
* html5 draws to... an html5 canvas?

Fix called C++ object pointer is null

Signed-off-by: Jérôme Duval <jerome.duval@gmail.com>

AppServer: Organize "HWInterface" classes

* Organize interface classes into directories
* Long term this will assist in the multi-head
interface / accelerant changes.
* local draws to the local hw accelerant
* remote draws to a remote connection (???)
* html5 draws to... an html5 canvas?