Implement framework for custom modules and out of the box custom modules as well. (#213)

* Create declarative module scaffolding

* Added ram module (WIP)

* Updates to options, styling and more.

* Added function for styling custom modules.

* Added utility functions and cleaned up code

* Type and fn name updates.

* Update module utils to handle absent values.

* Added icon color in style2 that was missing.

* Linted utils.ts

* Add CPU module and update RAM module to use /proc/meminfo.

* Added disk storage module.

* Consolidate code

* Added netstat module and removed elements from systray default ignore list.

* Added keyboard layout module.

* Fix hook types and move module to customModules directory

* Added updates modules.

* Spacing updates

* Added weather module.

* Added power menu and power module in bar. Increased update default interval to 6 ours.

* Updated styling of bar buttons, made power menu label toggleable, etc.

* Consolidate code and add dynamic tooltips based on data being used.

* Make default custom mogules matugen compatible

* Update base theme

* Fix custom module background coloring

* Remove testing opacity.

* Update themes to account for new modules

* Update nix stuff for libgtop (Need someone to test this)

* Update nix

* Update fractions to multiplications

* Move styling in style directory

* Implement a polling framework for variables that can dynamically adjust polling intervals.

* Netstat module updates when interface name is changed.

* Readme update

customModules/cpu/computeCPU.ts

@@ -0,0 +1,23 @@
+// @ts-expect-error
+import GTop from 'gi://GTop';
+
+const defaultCpuData: number = 0;
+
+let previousCpuData = new GTop.glibtop_cpu();
+GTop.glibtop_get_cpu(previousCpuData);
+
+export const computeCPU = () => {
+    const currentCpuData = new GTop.glibtop_cpu();
+    GTop.glibtop_get_cpu(currentCpuData);
+
+    // Calculate the differences from the previous to current data
+    const totalDiff = currentCpuData.total - previousCpuData.total;
+    const idleDiff = currentCpuData.idle - previousCpuData.idle;
+
+    const cpuUsagePercentage = totalDiff > 0 ? ((totalDiff - idleDiff) / totalDiff) * 100 : 0;
+
+    previousCpuData = currentCpuData;
+
+    return cpuUsagePercentage;
+}
+