Version detection improvements, Mullvad web scraping fix and changelog addition, code readability improvements, general tweaks/bugfixes (#400)

1. Apps that don't have "standard" versioning formats now automatically stop using version detection. This will prevent users from having to learn about this feature and enable it manually.
    - For such Apps, the "standard" version detection option is greyed out.
2. The Mullvad Source recently broke due to a slight change in their website design. This is now fixed.
    - Mullvad also now provides an in-app changelog via their official GitHub repo.
3. Code has been refactored for readability (specifically the version detection code and UI code for most screens).
4. Minor UI tweaks and bugfixes.

pubspec.lock

@@ -409,10 +409,10 @@ packages:
     dependency: "direct main"
     description:
       name: path_provider
-      sha256: "04890b994ee89bfa80bf3080bfec40d5a92c5c7a785ebb02c13084a099d2b6f9"
+      sha256: c7edf82217d4b2952b2129a61d3ad60f1075b9299e629e149a8d2e39c2e6aad4
       url: "https://pub.dev"
     source: hosted
-    version: "2.0.13"
+    version: "2.0.14"
   path_provider_android:
     dependency: transitive
     description:
@@ -425,10 +425,10 @@ packages:
     dependency: transitive
     description:
       name: path_provider_foundation
-      sha256: "12eee51abdf4d34c590f043f45073adbb45514a108bd9db4491547a2fd891059"
+      sha256: "818b2dc38b0f178e0ea3f7cf3b28146faab11375985d815942a68eee11c2d0f7"
       url: "https://pub.dev"
     source: hosted
-    version: "2.2.0"
+    version: "2.2.1"
   path_provider_linux:
     dependency: transitive
     description:
@@ -473,10 +473,10 @@ packages:
     dependency: transitive
     description:
       name: permission_handler_apple
-      sha256: "9c370ef6a18b1c4b2f7f35944d644a56aa23576f23abee654cf73968de93f163"
+      sha256: ee96ac32f5a8e6f80756e25b25b9f8e535816c8e6665a96b6d70681f8c4f7e85
       url: "https://pub.dev"
     source: hosted
-    version: "9.0.7"
+    version: "9.0.8"
   permission_handler_platform_interface:
     dependency: transitive
     description:
@@ -553,10 +553,10 @@ packages:
     dependency: "direct main"
     description:
       name: shared_preferences
-      sha256: ee6257848f822b8481691f20c3e6d2bfee2e9eccb2a3d249907fcfb198c55b41
+      sha256: "78528fd87d0d08ffd3e69551173c026e8eacc7b7079c82eb6a77413957b7e394"
       url: "https://pub.dev"
     source: hosted
-    version: "2.0.18"
+    version: "2.0.20"
   shared_preferences_android:
     dependency: transitive
     description:
@@ -585,10 +585,10 @@ packages:
     dependency: transitive
     description:
       name: shared_preferences_platform_interface
-      sha256: "824bfd02713e37603b2bdade0842e47d56e7db32b1dcdd1cae533fb88e2913fc"
+      sha256: fb5cf25c0235df2d0640ac1b1174f6466bd311f621574997ac59018a6664548d
       url: "https://pub.dev"
     source: hosted
-    version: "2.1.1"
+    version: "2.2.0"
   shared_preferences_web:
     dependency: transitive
     description:
@@ -710,10 +710,10 @@ packages:
     dependency: transitive
     description:
       name: url_launcher_android
-      sha256: "845530e5e05db5500c1a4c1446785d60cbd8f9bd45e21e7dd643a3273bb4bbd1"
+      sha256: dd729390aa936bf1bdf5cd1bc7468ff340263f80a2c4f569416507667de8e3c8
       url: "https://pub.dev"
     source: hosted
-    version: "6.0.25"
+    version: "6.0.26"
   url_launcher_ios:
     dependency: transitive
     description:
@@ -806,10 +806,10 @@ packages:
     dependency: transitive
     description:
       name: webview_flutter_wkwebview
-      sha256: ab12479f7a0cf112b9420c36aaf206a1ca47cd60cd42de74a4be2e97a697587b
+      sha256: d601aba11ad8d4481e17a34a76fa1d30dee92dcbbe2c58b0df3120e9453099c7
       url: "https://pub.dev"
     source: hosted
-    version: "3.2.1"
+    version: "3.2.3"
   win32:
     dependency: transitive
     description: