added a flag to hide settings (#5263)

Added an optional flag in settings.yml to hide the settings button in no
login servers. When hidden, users can no longer:

- Open the Settings modal at all (gear button is hidden)
- Change General preferences (tool picker mode, hide unavailable
tools/conversions, auto‑unzip and file limit)
- Configure keyboard shortcuts (Hotkeys / Keyboard Shortcuts section)
- Use the in‑app update checker UI (see current/latest version, check
for updates, view update details)
- Note: When enableLogin === true, the flag is ignored and the Settings
button remains visible.

---------

Co-authored-by: Anthony Stirling <77850077+Frooodle@users.noreply.github.com>
Co-authored-by: Reece Browne <74901996+reecebrowne@users.noreply.github.com>

build.gradle

@@ -60,7 +60,7 @@ repositories {
 
 allprojects {
     group = 'stirling.software'
-    version = '2.1.5'
+    version = '2.2.0'
 
     configurations.configureEach {
         exclude group: 'commons-logging', module: 'commons-logging'