FlatLaf look-and-feel with better Dark mode support. (#23)

This PR configures Symon to use the FlatLaf Swing look-and-feel, giving both a slightly more modern look but also much better support for Dark/Light UI modes. Additional small tweaks to make the UI more readable in both Dark/Light modes.

Detection of system theme also added, selecting the Dark/Light FlatLaf variant accordingly.

Gets rid of need for the hardcoded Metal UI for text fields in StatusPanel workaround as well, as FlatLaf renders these small fields correctly.

Reviewed-on: https://codeberg.org/sethm/symon/pulls/23
Reviewed-by: Seth Morabito <sethm@noreply.codeberg.org>

pom.xml

@@ -1,5 +1,6 @@
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/maven-v4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/maven-v4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.loomcom.symon</groupId>
     <artifactId>symon</artifactId>
@@ -15,12 +16,33 @@
             UTF-8
         </project.reporting.outputEncoding>
     </properties>
+    <repositories>
+        <repository>
+            <id>jitpack.io</id>
+            <url>https://jitpack.io</url>
+        </repository>
+    </repositories>
     <dependencies>
         <dependency>
             <groupId>ch.qos.logback</groupId>
             <artifactId>logback-classic</artifactId>
             <version>1.5.16</version>
         </dependency>
+        <dependency>
+            <groupId>commons-cli</groupId>
+            <artifactId>commons-cli</artifactId>
+            <version>1.5.0</version>
+        </dependency>
+        <dependency>
+            <groupId>com.formdev</groupId>
+            <artifactId>flatlaf</artifactId>
+            <version>3.7.1</version>
+        </dependency>
+        <dependency>
+            <groupId>com.github.Dansoftowner</groupId>
+            <artifactId>jSystemThemeDetector</artifactId>
+            <version>3.9.1</version>
+        </dependency>
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
@@ -33,11 +55,6 @@
             <version>4.11.0</version>
             <scope>test</scope>
         </dependency>
-        <dependency>
-            <groupId>commons-cli</groupId>
-            <artifactId>commons-cli</artifactId>
-            <version>1.5.0</version>
-        </dependency>
     </dependencies>
 
     <build>
@@ -48,7 +65,8 @@
                 <version>3.2.0</version>
                 <configuration>
                     <transformers>
-                        <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
+                        <transformer
+                            implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                             <mainClass>com.loomcom.symon.Main</mainClass>
                         </transformer>
                     </transformers>
@@ -120,4 +138,4 @@
             </plugin>
         </plugins>
     </build>
-</project>
+</project>