Build 55

- Pause the program before exiting when an error happens.
- Made the hint grid border non-transparent by default.

pom.xml

@@ -5,7 +5,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>mousemaster</groupId>
     <artifactId>mousemaster</artifactId>
-    <version>54</version>
+    <version>55</version>
     <name>mousemaster</name>
     <!--
     See https://graalvm.github.io/native-build-tools/latest/maven-plugin-quickstart.html