feat(wm): add cmd to identify 'close to tray' apps

Issue #6 highlighted a workflow that I don't personally use, but I am
sure is common among other Windows users, which is to use the Close
button to minimize an application to the tray.

Since this is largely a configurable option in those applications
(Discord etc.), I have implemented a command for the user to identify
those applications themselves when configuring the window manager,
instead of adding them to the previous Vec of known multi-window
applications that need to be identified by default.

Close/minimize to tray applications can be identified either by their
class or their executable name.

I figure it is pretty important to know the rules defined on the window
manager instance, so I have exposed these on a new window_manager::State
struct which is now what get returns from the 'komorebic.exe state'
command.

resolve #6

README.md

@@ -87,6 +87,16 @@ You can similarly stop the process by running `komorebic stop`.
 If you have AutoHotKey installed and a `komorebi.ahk` file in your home directory (run `$Env:UserProfile` at a
 PowerShell prompt to find your home directory), `komorebi` will automatically try to load it when starting.
 
+If you are experiencing behaviour where
+[closing a window leaves a blank tile, but minimizing the same window does not](https://github.com/LGUG2Z/komorebi/issues/6),
+you have probably enabled a 'close/minimize to tray' option for that application. You can tell _komorebi_ to handle this
+application appropriately by identifying it via the executable name or the window class:
+
+```powershell
+komorebic.exe identify-tray-application exe Discord.exe
+komorebic.exe identify-tray-application exe Telegram.exe
+```
+
 ## Configuration
 
 As previously mentioned, this project does not handle anything related to keybindings and shortcuts directly. I
@@ -115,6 +125,7 @@ sample [komorebi.ahk](komorebi.sample.ahk) AHK script that you can use as a star
 - [x] Floating rules based on exe name
 - [x] Floating rules based on window title
 - [x] Floating rules based on window class
+- [x] Identify 'close/minimize to tray' applications
 - [x] Toggle floating windows
 - [x] Toggle monocle window
 - [x] Toggle focus follows mouse
@@ -130,7 +141,7 @@ sample [komorebi.ahk](komorebi.sample.ahk) AHK script that you can use as a star
 If you would like to contribute code to this repository, there are a few requests that I have to ensure a foundation of
 code quality, consistency and commit hygiene:
 
-- Flatten all `use` statements except in `bindings/build.rs`
+- Flatten all `use` statements
 - Run `cargo +nightly clippy` and ensure that all lints and suggestions have been addressed before committing
 - Run `cargo +nightly fmt --all` to ensure consistent formatting before committing
 - Use `git cz` with