fix: rename soul_echo => soulecho

removed all occurences of soul_echo as it made problems for mobile

src-tauri/src/main.rs

@@ -2,5 +2,5 @@
 #![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]
 
 fn main() {
-    soul_echo_lib::run()
+    soulecho_lib::run()
 }