Added the ability to define custom icons for the system tray. (#408)

* Added the ability to define custom icons for the system tray.

* Add placeholder icon if icon is not defined.

* Update themes

options.ts

@@ -13,6 +13,7 @@ import {
     WindowLayer,
 } from 'lib/types/options';
 import { MatugenScheme, MatugenTheme, MatugenVariations } from 'lib/types/options';
+import { SystrayIconMap } from 'lib/types/systray';
 import { UnitType } from 'lib/types/weather';
 import { Transition } from 'lib/types/widget';
 import { ApplicationIcons, WorkspaceIcons, WorkspaceIconsColored } from 'lib/types/workspace';
@@ -242,6 +243,7 @@ const options = mkOptions(OPTIONS, {
                 },
                 systray: {
                     enableBorder: opt(false),
+                    customIcon: opt(colors.text),
                     border: opt(colors.lavender),
                     background: opt(colors.base2),
                     spacing: opt('0.5em'),
@@ -923,6 +925,7 @@ const options = mkOptions(OPTIONS, {
         },
         systray: {
             ignore: opt<string[]>([]),
+            customIcons: opt<SystrayIconMap>({}),
         },
         clock: {
             icon: opt('󰸗'),