Add probot stale configuration

We want to get issues without activity closed after a while unless they
are marked with specific labels to keep things clean and maintainable.

Fix clang build errors

cmds: add override for Intel Core i5 M 460

This commit uses GCC friendly pragmas to demote a clang error on
C99-specific feature usage to a warning.

The C99 feature that is used here is compound literals. It gets used
trough a macro from the dbus C library.

This removes the constexpr const char * default_glesv1_lib and promote
-Wunused-const-variable back to error level on clang.

Remove a unused lambda capture on [this] in
anbox::cmds::CheckFeatures::CheckFeatures() and promote
-Wunused-lambda-capture back to error level on clang.

This commit removes the private unused field type_ from anbox::dbus::Bus
and promotes -Wunused-private-field back to error level on clang.

cmds: add override for Intel Celeron N2840

This commit downgrades the following clang compiler errors into warnings:
 * unused-private-field
 * unused-const-variable
 * unused-lambda-capture

Change -Wcast-align from error to warning for clang compiler by adding
the -Wno-error=cast-align compiler flag.

Fixes #881

In some spare situations it might be useful to change the network
configuration of the bridge and with that also the configuration of
the Android container itself. We don't validate the configuration
and just apply it no matter if it ends up with network connectivity
in the container.

Not all CPUs can be detected with their correct feature set. For example
does cpu_features not work well enough when the support does not support
AVX (see https://github.com/google/cpu_features/issues/4). To mitigate
this we maintain a list of whitelisted CPU models.

Add ANBOX_NO_DESKTOP_SUBDIR env

Add option to enable/disable wayland

This makes anbox place applications in the main application folder

This is mostly a hack for ubuntu touch

sdl: disable touch input support by default

It looks like that the Android system gets confused when both a pointer
and an touch based input device are connected to the system. As touch
support is so far only used Ubports we can keep it disabled for the
snap version but provide a configuration switch to enable it again.

container: correctly calculate uid/gid maps

We were calculating the first range towards the ID of the executing user
which is wrong if we want to map the current user to id 1000 inside the
container. This corrects the code to calculate the first range until
1000-1, assigns 1000 to the current user and then continues to assign
1000+1 to the rest of the high-range ids we have allocated.

cmds: ignore cpu feature check on QEMU

sdl: don't prevent screensaver to systems to suspend properly

The cpu_features library doesn't work well enough on QEMU so we skip the
test on any QEMU branded CPU.

Make network bridge configurable