fix(app): make instances with non-UTF8 text file encodings launcheable and importable (#3721)

Previous to these changes, the app always assumed that Minecraft and
other launchers always use UTF-8, which is not necessarily always true.

Cargo.lock

@@ -1379,6 +1379,17 @@ version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "613afe47fcd5fac7ccf1db93babcb082c5994d996f20b8b159f2ad1658eb5724"
 
+[[package]]
+name = "chardetng"
+version = "0.1.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "14b8f0b65b7b08ae3c8187e8d77174de20cb6777864c6b832d8ad365999cf1ea"
+dependencies = [
+ "cfg-if",
+ "encoding_rs",
+ "memchr",
+]
+
 [[package]]
 name = "chrono"
 version = "0.4.41"
@@ -8865,6 +8876,7 @@ dependencies = [
  "async_zip",
  "base64 0.22.1",
  "bytes",
+ "chardetng",
  "chrono",
  "daedalus",
  "dashmap",
@@ -8872,6 +8884,7 @@ dependencies = [
  "discord-rich-presence",
  "dunce",
  "either",
+ "encoding_rs",
  "enumset",
  "flate2",
  "fs4",