debian/rules: actually rework workaround so that it triggers.

Attributes GL MR !5: !5

Previously, it didn't, because the workaround only triggered if the
trigger variable was non-zero, which naturally won't work.

Initialize it to "auto" instead and check if "auto" has been used,
otherwise do nothing.

debian/control: add BD on lsb-release for the arm* user-mode emulation
workaround to actually trigger.

Attributes GL MR !4: !4

debian/control: add BD on lsb-release for the arm* user-mode emulation workaround to actually trigger.

debian/rules: backport/copy X2Go Client workaround for lrelease failure when building under user-mode emulation.

In user-mode emulation, lrelease wrongly detects a cross-compiling
situation and fails to load the default mkspec for some reason.

Debugging this is incredibly frustrating, especially since strace and
gdb do not work correctly in user-mode emulation.

Fortunately, we can work around this issue by specifying QMAKESPEC
directly, ironically with values queried from qmake.

We will do that for Debian 12+ only for now. Note that this is not an
issue with full-machine emulation, since the inner system is
unsuspecting to the actual bare-metal host.

Add option to disable the toolbar.

Attributes GL MR !3: !3

We need to know whether we are in debug or not in order for our debug
printing to work correctly.

client.cpp: make sure that the error message regarding an unavailable options file is always printed in parseOptions ().

This would actually require a lot more work all around the program, but
I'm too lazy to go through all of it.

Unlike KDRStdErr (), it does not depend upon the debug setting and will
always output.

Fix pin icon location.

Attributes GL MR !2: https://gitlab.x2go.org/x2go/client/x2godriveclient/-/merge_requests/2

debian/Jenkinsfile: Add file. Initiate CI builds.

See merge request !1

res/: add i18n directory and x2gokdriveclient_de.ts translation file with the initial German translation.

x2gokdriveclient.pro: add VERSION variable, currently unused, but might become handy at a later point in time.