refactor: introducing ViewModel (#17)

* move to viewModel; use submodule to import miuix

* replace widgets with which implemented in miuix

* update CHANGELOG.md

* fix: coroutine handling

* chore: code formatting

* viewModel for TerminalScreen

* viewModel for FileManagerScreen

* chore: code formatting

* fix for review

* chore: optimize imports

settings.gradle.kts

@@ -29,4 +29,5 @@ dependencyResolutionManagement {
 }
 
 rootProject.name = "Scrcpy"
+includeBuild("submodule/miuix")
 include(":app")