desktop: in-app update functionality (#4443)

* desktop: in-app update functionality

* without Android

* refactor

* working windows

* tabs vs spaces

* better working mac

* changes

* repo

* undo manifest changes

* changes

* changes

* unneeded changes

* revert

* new line

* fix update notice

* different way

* changes to mac logic

* changes to mac logic

* more

* update strings

---------

Co-authored-by: Evgeny Poberezkin <evgeny@poberezkin.com>

apps/multiplatform/common/src/androidMain/kotlin/chat/simplex/common/platform/Files.android.kt

@@ -29,6 +29,8 @@ actual val remoteHostsDir: File = File(tmpDir.absolutePath + File.separator + "r
 
 actual fun desktopOpenDatabaseDir() {}
 
+actual fun desktopOpenDir(dir: File) {}
+
 @Composable
 actual fun rememberFileChooserLauncher(getContent: Boolean, rememberedValue: Any?, onResult: (URI?) -> Unit): FileChooserLauncher {
   val launcher = rememberLauncherForActivityResult(