feat(sysinfo): overhaul to add aggregate/unit/formatting support

This completely reworks the sysinfo module to add support for aggregate functions, better support for working with individual devices, the ability to specify units, and some string formatting support.

Several new tokens have also been added, and performance should be marginally improved.

BREAKING CHANGE: Use of the `sys_info` module in your config will need to be updated to use the new token format. See the wiki page for more info.

src/modules/sysinfo/token.rs

@@ -0,0 +1,66 @@
+use crate::clients::sysinfo::{Function, Prefix};
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum TokenType {
+    CpuFrequency,
+    CpuPercent,
+
+    MemoryFree,
+    MemoryAvailable,
+    MemoryTotal,
+    MemoryUsed,
+    MemoryPercent,
+
+    SwapFree,
+    SwapTotal,
+    SwapUsed,
+    SwapPercent,
+
+    TempC,
+    TempF,
+
+    DiskFree,
+    DiskTotal,
+    DiskUsed,
+    DiskPercent,
+    DiskRead,
+    DiskWrite,
+
+    NetDown,
+    NetUp,
+
+    LoadAverage1,
+    LoadAverage5,
+    LoadAverage15,
+    Uptime,
+}
+
+#[derive(Debug, Clone)]
+pub struct Token {
+    pub token: TokenType,
+    pub function: Function,
+    pub prefix: Prefix,
+    pub formatting: Formatting,
+}
+
+#[derive(Debug, Clone)]
+pub enum Part {
+    Static(String),
+    Token(Token),
+}
+
+#[derive(Debug, Clone, Copy)]
+pub struct Formatting {
+    pub width: usize,
+    pub fill: char,
+    pub align: Alignment,
+    pub precision: usize,
+}
+
+#[derive(Debug, Clone, Copy, Default, PartialEq, Eq)]
+pub enum Alignment {
+    #[default]
+    Left,
+    Center,
+    Right,
+}