Chinese theme; Fallback theme; New signs (#1523)

* Road signs theme for China; new Fallback theme; Moved RoadUI signs into Fallback theme
* Fix bug with Fallback theme loading; Fallback theme loads white textures for all missing files
* Update translations
* Fix to yield sign of Chinese theme; was not square now it is
* New feature for basing themes on other themes; Generic Chinese theme "patches" Mainland Chinese
* Renamed RoadDefaults; Removed old vehicle restriction signs; README added
* Restriction signs from junction restrictions now moved to Fallback theme and SVG sources added
* Blue allow icons for other restrictions
* Remove Junction restrictions old textures - Now in Fallback theme
* Green allow signs for Fallback, China and China_Generic
* Replaced some icons with Nounproject icons
* Changed cargo train icon back to hopper; Added proposed icons for air and boat cargo
* Changed TAXI text for Simplified Chinese
* Generic China texture does not have speed limit signs and refers to parent China Mainland theme
* Update strings (again)

Author: kvakvs

TLM/TLM/Lifecycle/TMPELifecycle.cs

@@ -172,8 +172,7 @@ internal void RegisterCustomManagers() {
             RegisteredManagers.Add(ExtVehicleManager.Instance);
 
             // Texture managers
-            RegisteredManagers.Add(UI.Textures.RoadSignThemes.Instance);
-            RegisteredManagers.Add(UI.Textures.JunctionRestrictions.Instance);
+            RegisteredManagers.Add(UI.Textures.RoadSignThemeManager.Instance);
             RegisteredManagers.Add(UI.Textures.RoadUI.Instance);
             RegisteredManagers.Add(UI.Textures.TrafficLightTextures.Instance);
 

TLM/TLM/Manager/Impl/OptionsManager.cs

@@ -330,7 +330,6 @@ internal static void RebuildMenu(bool languageChanged = false) {
             }
 
             if (languageChanged) {
-                RoadUI.Instance.ReloadTexturesWithTranslation();
                 TrafficLightTextures.Instance.ReloadTexturesWithTranslation();
                 TMPELifecycle.Instance.TranslationDatabase.ReloadTutorialTranslations();
                 TMPELifecycle.Instance.TranslationDatabase.ReloadGuideTranslations();