feat(deep-link): implement getCurrent on Windows/Linux (#1759)

* feat(deep-link): implement getCurrent on Windows/Linux

checks std::env::args() on initialization, also includes integration with the single-instance plugin

* fmt

* update docs, fix event

* add register_all function

* expose api

* be nicer on docs, clippy

.changes/config.json

@@ -268,7 +268,8 @@
     },
     "single-instance": {
       "path": "./plugins/single-instance",
-      "manager": "rust"
+      "manager": "rust",
+      "dependencies": ["deep-link"]
     },
     "sql": {
       "path": "./plugins/sql",

.changes/deep-link-get-current-desktop.md

@@ -0,0 +1,5 @@
+---
+"deep-link": patch
+---
+
+Implement `get_current` on Linux and Windows.

.changes/deep-link-register-all.md

@@ -0,0 +1,5 @@
+---
+"deep-link": patch
+---
+
+Added `register_all` to register all desktop schemes - useful for Linux to not require a formal AppImage installation.

.changes/single-instance-deep-link.md

@@ -0,0 +1,5 @@
+---
+"single-instance": patch
+---
+
+Integrate with the deep link plugin out of the box.