Rename snake_case functions from localisation folder

src/openrct2/core/String.cpp

@@ -297,7 +297,7 @@ namespace String
 
     size_t LengthOf(const utf8* str)
     {
-        return utf8_length(str);
+        return UTF8Length(str);
     }
 
     size_t SizeOf(const utf8* str)
@@ -478,7 +478,7 @@ namespace String
 
     size_t GetCodepointLength(codepoint_t codepoint)
     {
-        return utf8_get_codepoint_length(codepoint);
+        return UTF8GetCodepointLength(codepoint);
     }
 
     codepoint_t GetNextCodepoint(utf8* ptr, utf8** nextPtr)
@@ -488,18 +488,18 @@ namespace String
 
     codepoint_t GetNextCodepoint(const utf8* ptr, const utf8** nextPtr)
     {
-        return utf8_get_next(ptr, nextPtr);
+        return UTF8GetNext(ptr, nextPtr);
     }
 
     utf8* WriteCodepoint(utf8* dst, codepoint_t codepoint)
     {
-        return utf8_write_codepoint(dst, codepoint);
+        return UTF8WriteCodepoint(dst, codepoint);
     }
 
     void AppendCodepoint(std::string& str, codepoint_t codepoint)
     {
         char buffer[8]{};
-        utf8_write_codepoint(buffer, codepoint);
+        UTF8WriteCodepoint(buffer, codepoint);
         str.append(buffer);
     }
 
@@ -755,5 +755,5 @@ namespace String
 
 char32_t CodepointView::iterator::GetNextCodepoint(const char* ch, const char** next)
 {
-    return utf8_get_next(ch, next);
+    return UTF8GetNext(ch, next);
 }