Added libui to gems list to use in future for its open_folder dialogs, improvements to server list updater and server browser to correctly handle unregistering and registering servers

Gemfile.lock

@@ -3,22 +3,20 @@ GEM
   specs:
     base64 (0.2.0)
     concurrent-ruby (1.2.3)
-    cyberarm_engine (0.24.2)
-      excon (~> 0.88)
+    cyberarm_engine (0.24.4)
       gosu (~> 1.1)
-      gosu_more_drawables (~> 0.3)
     digest-crc (0.6.5)
       rake (>= 12.0.0, < 14.0.0)
     event_emitter (0.2.6)
     excon (0.109.0)
-    ffi (1.16.3-x64-mingw-ucrt)
+    ffi (1.16.3)
     ffi-win32-extensions (1.0.4)
       ffi
     gosu (1.4.6)
-    gosu_more_drawables (0.3.1)
     i18n (1.14.1)
       concurrent-ruby (~> 1.0)
     ircparser (1.0.0)
+    libui (0.0.15)
     rake (13.1.0)
     rexml (3.2.6)
     rubyzip (2.3.2)
@@ -41,8 +39,10 @@ DEPENDENCIES
   base64
   cyberarm_engine
   digest-crc
+  excon
   i18n
   ircparser
+  libui
   rexml
   rubyzip
   sdl2-bindings