This fixes a lint warning.

Now that scrcpy-server.jar is found in the same directory as the
scrcpy executable, using SCRCPY_SERVER_PATH is not particularly useful
on Windows anymore

Issue 9 was about stdout/stderr not printed in Windows console. This is
solved since the Windows version is cross-compiled from Linux.

Include the latest version of adb in Windows releases.

Revert "Update SDL (2.0.9) for Windows"

Several users experienced freezes with SDL 2.0.9.

This reverts commit a5787dcc.

See:
 - <https://github.com/Genymobile/scrcpy/issues/425>
 - <https://discourse.libsdl.org/t/unstable-frame-rate-unexpectedly/25783>

Include the latest version of FFmpeg in Windows releases.

In portable builds, scrcpy-server.jar was supposed to be present in the
current directory, so in practice it worked only if scrcpy was launched
from its own directory.

Instead, find the absolute path of the executable and build a suitable
path to use scrcpy-server.jar from the same directory.

There was already utf8_to_wide_char(), used to correctly execute
commands on Windows.

Add the reverse converter: utf8_from_wide_char(). We will need it to
build the scrcpy-server path based on the executable directory.

The filename is used at several places.

To create a portable build (with scrcpy-server.jar accessible from the
scrcpy directory), replace OVERRIDE_SERVER_PATH by a simple compilation
flag: PORTABLE.

This paves the way to use more complex rules to determine the path of
scrcpy-server.jar in portable builds.

The full path of scrcpy-server.jar was partially configured from
meson.build then concatenated by C code.

Instead, directly write the path in C.

On socket disconnection, on Linux, recv() returns -1 and errno is set.
But on Windows, errno is 0.

In that case, AVERROR(errno) == 0, leading to the warning:

> Invalid return value 0 for stream protocol

To avoid the problem, if errno is 0, return AVERROR_EOF.

Ref: commit 2876463d

Just in case.

They are just tiny wrappers.

The FPS counter was called only on new frames, so it could not print
values regularly, especially when there are very few FPS (when the
device surface does not change).

To the extreme, it was never able to display 0 fps.

Add a separate thread to print framerate every second.

Add a "timed out" version of cond_wait().

After commit bfb86ca2, the controller
was not stopped and destroyed on quit.

Replace the compilation flag SKIP_FRAMES by a runtime flag to force
rendering of expired frames. By default, the expired frames are skipped.

Prepare indentation for --render-expired-frames.

In addition to the shortcut (Ctrl+o) to turn the device screen off, add
a command-line argument to turn it off on start.

Preparse indentation for --turn-screen-off.

If --no-control is disabled, there is no need for a controller.

It also avoids to power on the device on start if control is disabled.

Starting the server requires more and more parameters. For clarity,
group them in a struct.

For clarity, store the flag resulting of the command-line options
--no-control and --no-display into "control" and "display".

The flag is used only in the server_start() implementation, there is no
need to store it in the structure.

Only keep "turn device screen off" and POWER button.

After we turn the device screen off (with Ctrl+o), turning it back on
does not always work, and leaves the device in a weird state, where even
the power button may not be sufficient:
<https://github.com/Genymobile/scrcpy/issues/175#issuecomment-497946596>

This is not an acceptable behavior, so disable the shortcut to turn the
physical device screen on. We can use the POWER button (or Ctrl+p)
instead.

This will reduce confusion between "power on" when the device is off and
"turn device screen off" while mirroring.

The condition "event->type == SDL_KEYDOWN" and the variable
input_manager->controller are used many times. Replace them by local
variables to reduce verbosity.

So that it also works on Windows.

Introduced by the previous commit.

Add two shortcuts:
 - Ctrl+o to turn the device screen off while mirroring
 - Ctrl+Shift+o to turn it back on

On power on (either via the POWER key or BACK while screen is off), both
the device screen and the mirror are turned on.

<https://github.com/Genymobile/scrcpy/issues/175>

For consistency.

Signed-off-by: NYu-Chen Lin <npes87184@gmail.com>
Signed-off-by: NRomain Vimont <rom@rom1v.com>

Use the same variable name in functions declaration and definition.
Signed-off-by: NYu-Chen Lin <npes87184@gmail.com>
Signed-off-by: NRomain Vimont <rom@rom1v.com>

Synchronizing local and device clipboards in invisible. Add INFO logs
on success.