Add an icon for the plugins tab

I used this one: https://github.com/microsoft/fluentui-system-icons/tree/main/assets/Plug%20Disconnected/SVG
and modified it to be dark theme compatible

resources/licenses/fluenticons.txt

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2020 Microsoft Corporation
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

resources/settings/plugins.svg

@@ -0,0 +1,13 @@
+<?xml version="1.0" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20010904//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
+<!-- Created using Krita: https://krita.org -->
+<svg xmlns="http://www.w3.org/2000/svg" 
+    xmlns:xlink="http://www.w3.org/1999/xlink"
+    xmlns:krita="http://krita.org/namespaces/svg/krita"
+    xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+    width="1.728pt"
+    height="1.728pt"
+    viewBox="0 0 1.728 1.728">
+<defs/>
+<path id="shape0" transform="matrix(0.072 0 0 0.072 0.143115521579684 0.144884750976744)" fill="#ffffff" stroke="#000000" stroke-width="0.72" stroke-linecap="square" stroke-linejoin="bevel" d="M19.7193 1.69471C19.9014 1.50618 20.0022 1.25341 20 0.991311C19.9977 0.72921 19.8924 0.478233 19.7071 0.292893C19.5218 0.107553 19.2708 0.00231534 19.0087 3.77513e-05C18.7466 -0.00223983 18.4938 0.0986205 18.3053 0.280712L16.5083 2.07771C15.6935 1.57117 14.7307 1.35503 13.7775 1.46467C12.8244 1.57431 11.9358 2.00339 11.2573 2.68171L10.1893 3.75071C9.86149 4.07874 9.67716 4.52397 9.67716 4.98771C9.67716 5.45145 9.86149 5.89668 10.1893 6.22471L13.7743 9.81071C13.9915 10.0279 14.2621 10.1842 14.5588 10.2637C14.8555 10.3432 15.168 10.3432 15.4647 10.2637C15.7615 10.1842 16.0321 10.0279 16.2493 9.81071L17.3173 8.74271C17.9955 8.06436 18.4246 7.17606 18.5345 6.22312C18.6443 5.27017 18.4284 4.30755 17.9223 3.49271ZM8.71928 9.69471C8.90138 9.50618 9.00224 9.25341 8.99996 8.99131C8.99768 8.72921 8.89244 8.47823 8.7071 8.29289C8.52176 8.10755 8.27079 8.00232 8.00869 8.00004C7.74658 7.99776 7.49382 8.09862 7.30528 8.28071L5.83528 9.75071L5.54228 9.45771C5.40171 9.31732 5.21096 9.23837 5.01228 9.23837C4.81361 9.23837 4.62286 9.31732 4.48228 9.45771L2.70728 11.2327C2.02905 11.9111 1.59993 12.7994 1.49011 13.7523C1.38029 14.7052 1.59612 15.6679 2.10228 16.4827L0.305284 18.2807C0.151702 18.429 0.0495919 18.6227 0.0139927 18.8333C-0.0216064 19.0438 0.0111426 19.2603 0.107417 19.4509C0.203692 19.6415 0.358521 19.7963 0.549105 19.8926C0.739689 19.9889 0.956189 20.0216 1.16672 19.986C1.37725 19.9504 1.57095 19.8483 1.71928 19.6947L3.51728 17.8977C4.33212 18.4039 5.29475 18.6197 6.24769 18.5099C7.20063 18.4001 8.08894 17.9709 8.76728 17.2927L10.5423 15.5177C10.6827 15.3771 10.7616 15.1864 10.7616 14.9877C10.7616 14.789 10.6827 14.5983 10.5423 14.4577L10.2493 14.1647L11.7193 12.6947C11.9014 12.5062 12.0022 12.2534 12 11.9913C11.9977 11.7292 11.8924 11.4782 11.7071 11.2929C11.5218 11.1076 11.2708 11.0023 11.0087 11C10.7466 10.9978 10.4938 11.0986 10.3053 11.2807L8.83528 12.7507L7.24928 11.1647Z" sodipodi:nodetypes="cccccccccccccccccccccccccccccccccccccccccccccccccccc"/>
+</svg>

src/widgets/dialogs/SettingsDialog.cpp

@@ -217,7 +217,7 @@ void SettingsDialog::addTabs()
     this->addTab([]{return new NotificationPage;},     "Live Notifications",  ":/settings/notification2.svg");
     this->addTab([]{return new ExternalToolsPage;},    "External tools", ":/settings/externaltools.svg");
 #ifdef CHATTERINO_HAVE_PLUGINS
-    this->addTab([]{return new PluginsPage;},          "Plugins",        ":/settings/externaltools.svg");
+    this->addTab([]{return new PluginsPage;},          "Plugins",        ":/settings/plugins.svg");
 #endif
     this->ui_.tabContainer->addStretch(1);
     this->addTab([]{return new AboutPage;},            "About",          ":/settings/about.svg", SettingsTabId(), Qt::AlignBottom);

src/widgets/settingspages/AboutPage.cpp

@@ -116,6 +116,9 @@ AboutPage::AboutPage()
 #ifdef CHATTERINO_HAVE_PLUGINS
             addLicense(form.getElement(), "lua", "https://lua.org",
                        ":/licenses/lua.txt");
+            addLicense(form.getElement(), "Fluent icons",
+                       "https://github.com/microsoft/fluentui-system-icons",
+                       ":/licenses/fluenticons.txt");
 #endif
         }