Fails to run if home directory is write protected (cannot extract SWT native library files)

**Describe the bug**
Getting an error on startup on a fresh install of Ubuntu 20.04 + openjdk. It's a missing JWT dependency, that is neither documented in the README nor the Debian control file.

**To Reproduce**
- fresh Ubuntu 20.04 install
- `apt install default-jdk`
- `dpkg -i ipscan_3.7.6_amd64.deb`
```
Selecting previously unselected package ipscan.
(Reading database ... 220101 files and directories currently installed.)
Preparing to unpack ipscan_3.7.6_amd64.deb ...
Unpacking ipscan (3.7.6) ...
Setting up ipscan (3.7.6) ...
Processing triggers for gnome-menus (3.36.0-1ubuntu1) ...
Processing triggers for desktop-file-utils (0.24-1ubuntu3) ...
Processing triggers for mime-support (3.64ubuntu1) ...
```
- launch ipscan
- error (see screenshot, and logs section)

**Expected behavior**
- the debian package installation step should fail because of an unsatisfied SWT library dependency.
the debian control file looks incomplete: `Depends: DEPENDS java8-runtime` (this is not sufficient)
- a hint should be included in the error message (or this project's README) as to what the JWT dependency
to install is called for the operating system I'm running on.

**Screenshots**

**Versions (please complete the following information):**
- OS type and version: 5.8.0-50-generic #56~20.04.1-Ubuntu SMP Mon Apr 12 21:46:35 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
- Java version, 32 or 64 bit, how was installed (`java -version`):
```
$ java -version
openjdk version "11.0.10" 2021-01-19
OpenJDK Runtime Environment (build 11.0.10+9-Ubuntu-0ubuntu1.20.04)
OpenJDK 64-Bit Server VM (build 11.0.10+9-Ubuntu-0ubuntu1.20.04, mixed mode, sharing)
```
installed with `apt-get install default-jdk`
- Version of Angry IP Scanner: 3.7.6

**Logs:**
```
$ ipscan
java.lang.UnsatisfiedLinkError: Could not load SWT library. Reasons:
no swt-gtk-4940r23 in java.library.path: [/usr/java/packages/lib, /usr/lib/x86_64-linux-gnu/jni, /lib/x86_64-linux-gnu, /usr/lib/x86_64-linux-gnu, /usr/lib/jni, /lib, /usr/lib]
no swt-gtk in java.library.path: [/usr/java/packages/lib, /usr/lib/x86_64-linux-gnu/jni, /lib/x86_64-linux-gnu, /usr/lib/x86_64-linux-gnu, /usr/lib/jni, /lib, /usr/lib]
Can't load library: /home/lestephane/libswt-gtk-4940r23-64.so
Can't load library: /home/lestephane/libswt-gtk-64.so

at org.eclipse.swt.internal.Library.loadLibrary(Library.java:338)
at org.eclipse.swt.internal.Library.loadLibrary(Library.java:257)
at org.eclipse.swt.internal.C.(C.java:19)
at org.eclipse.swt.internal.Converter.wcsToMbcs(Converter.java:209)
at org.eclipse.swt.internal.Converter.wcsToMbcs(Converter.java:155)
at org.eclipse.swt.widgets.Display.(Display.java:163)
at net.azib.ipscan.gui.GUI.(GUI.java:29)
at net.azib.ipscan.Main.main(Main.java:47)
```