Major module refactor (#19)

* refactor: major module restructuring

Modules now implement a "controller", which allows for separation of logic from UI code and enforces a tighter structure around how modules should be written. The introduction of this change required major refactoring or even rewriting of all modules.

This also better integrates the popup into modules, making it easier for data to be passed around without fetching the same thing twice

The refactor also improves some client code, switching from `ksway` to the much more stable `swayipc-async`. Partial multi-monitor for the tray module has been added.

BREAKING CHANGE: The `mpd` module config has changed, moving the icons to their own object.

src/modules/launcher/open_state.rs

@@ -1,4 +1,4 @@
-use crate::sway::SwayNode;
+use swayipc_async::Node;
 
 /// Open state for a launcher item, or item window.
 #[derive(Debug, Clone, Eq, PartialEq, Copy)]
@@ -9,25 +9,17 @@ pub enum OpenState {
 
 impl OpenState {
     /// Creates from `SwayNode`
-    pub const fn from_node(node: &SwayNode) -> Self {
+    pub const fn from_node(node: &Node) -> Self {
         Self::Open {
             focused: node.focused,
             urgent: node.urgent,
         }
     }
 
-    /// Creates open without focused/urgent
-    pub const fn open() -> Self {
-        Self::Open {
-            focused: false,
-            urgent: false,
-        }
-    }
-
     /// Creates open with focused
-    pub const fn focused() -> Self {
+    pub const fn focused(focused: bool) -> Self {
         Self::Open {
-            focused: true,
+            focused,
             urgent: false,
         }
     }
@@ -59,7 +51,7 @@ impl OpenState {
     /// This is effectively an OR operation,
     /// so sets state to open and flags to true if any state is open
     /// or any instance of the flag is true.
-    pub fn merge_states(states: Vec<&Self>) -> Self {
+    pub fn merge_states(states: &[&Self]) -> Self {
         states.iter().fold(Self::Closed, |merged, current| {
             if merged.is_open() || current.is_open() {
                 Self::Open {