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>

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.

Fix white screen of death in remotedesktop

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

Fixed C++11 warnings.

invalid suffix on literal; C++11 requires a space between literal and string macro
[-Werror=literal-suffix]

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?

Fixed C++11 warnings.

invalid suffix on literal; C++11 requires a space between literal and string macro
[-Werror=literal-suffix]

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?