The SDL mouse wheel event seems inconsistent between horizontal and
vertical scrolling.

> Movements to the left generate negative x values and to the right
> generate positive x values. Movements down (scroll backward) generate
> negative y values and up (scroll forward) generate positive y values.

<https://wiki.libsdl.org/SDL_MouseWheelEvent#Remarks>

Reverse the horizontal.

Fixes <https://github.com/Genymobile/scrcpy/issues/49>.

Document how to install on Fedora

Now that instructions are given for both Debian/Ubuntu and Fedora, use
subsections.

Document server and client dependencies separately, to avoid unneeded
packages installation when building using the prebuilt server.

Also remove "zip", since it's only used for building a portable version
(which is not documented in README).

Improve README syntax highlighting.

And fix spaces (do not randomly use non-breaking spaces for
indentation).

Do not leak the packet data on error.

Oops! The content of the packets were never freed.

Indicate how to run the app from the build directory in README. It's
convenient during development.

And update README.

Paste computer clipboard to the device on Ctrl+v.

The other direction (pasting the device clipboard to the computer) is
not implemented. It would require a communication channel from the
device to the computer, other than the socket used by the video stream.

Initializing with braces initializes the other fields to 0, which is not
necessary.

The High DPI support is enabled by default, so that the renderer use the
full definition of High DPI screens.

However, there are still mouse coordinates problems on some MacOS having
High DPI support (but not all), so expose a way to disable it.

A call to avcodec_receive_frame() may return AVERROR(EAGAIN) if more
input is required. This is not an error, do not fail.

Directly link to the relevant subsection.

Initialize variables only when necessary.

The API to decode the video frames is different depending on the
libavcodec version.

Move the new API usage to the #if-block.

The decoder sometimes returned a non-zero value on error, but not on
every path.

Since we never use the value, always return 0 at the end (like in the
controller).

Just enabling this flag breaks mouse location values.

This reverts commit 38b56f55.

The server socket does not release the port it was listening for if we
just close it: we must also shutdown it.

SDL_MouseWheelEvent does not provide the mouse location, so we used
SDL_GetMouseState() to retrieve it.

Unfortunately, SDL_GetMouseState() returns a position expressed in the
window coordinate system while the position filled in SDL events are
expressed in the renderer coordinate system. As a consequence, the
scroll was not applied at the right position on the device.

Therefore, convert the coordinate system.

See <https://stackoverflow.com/questions/49111054/how-to-get-mouse-position-on-mouse-wheel-event>.

Replace "at network level" by "at the network level".

Set the default video bitrate to 8Mbps. This greatly increase quality on
fast motion, without negative side effects.

The old name checkRotationChanged() did not suggest that the flag was
reset.

Use high DPI if available.

Note that on Mac OS X, setting this flag is not sufficient:

> On Apple's OS X you must set the NSHighResolutionCapable Info.plist
> property to YES, otherwise you will not receive a High DPI OpenGL
> display.

<https://wiki.libsdl.org/SDL_CreateWindow#flags>

Explain how to build, install and run the application.

On user request to quit, two kinds of blocking calls must be interrupted
on the server:
 1. the reads from and writes to the socket;
 2. the call to MediaCodec.dequeueOutputBuffer().

The former case was handled by calling shutdown() on the socket from the
client, but the latter was not managed.

There is no easy way to wake this call properly, so just terminate the
process from the client (i.e. send SIGTERM on Linux) instead.

Stop encoding if the codec signaled the end of stream.

The eof flag was read, but never written.

The server is copied to /data/local/tmp/scrcpy-server.jar and executed
on the device.

As soon as we are connected, we can unlink (rm) it from /data/local/tmp,
to keep the device clean.

The function adb_execute() now expects a "const char *const *" parameter
for the adb command, so there is no need to cast.

The Server class is in package scrcpy, there is no need to repeat the
name in the classname.