Refactor project structure and update dependencies

Removed old database-related implementations (`Database`, `Migrations`, and `Main`) and replaced them with a new focus on MIDI message handling. Updated project metadata, introduced multiplatform `MidiMessage` classes, and added publication/CI setup for Maven compatibility.

.idea/artifacts/midi_arrays_js_1_0_0_SNAPSHOT.xml

@@ -0,0 +1,8 @@
+<component name="ArtifactManager">
+  <artifact type="jar" name="midi-arrays-js-1.0.0-SNAPSHOT">
+    <output-path>$PROJECT_DIR$/build/libs</output-path>
+    <root id="archive" name="midi-arrays-js-1.0.0-SNAPSHOT.jar">
+      <element id="module-output" name="midi-arrays.jsMain" />
+    </root>
+  </artifact>
+</component>

.idea/artifacts/midi_arrays_jvm_1_0_0_SNAPSHOT.xml

@@ -0,0 +1,8 @@
+<component name="ArtifactManager">
+  <artifact type="jar" name="midi-arrays-jvm-1.0.0-SNAPSHOT">
+    <output-path>$PROJECT_DIR$/build/libs</output-path>
+    <root id="archive" name="midi-arrays-jvm-1.0.0-SNAPSHOT.jar">
+      <element id="module-output" name="midi-arrays.jvmMain" />
+    </root>
+  </artifact>
+</component>

.idea/jsLibraryMappings.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="JavaScriptLibraryMappings">
+    <excludedPredefinedLibrary name="midi-arrays/build/js/node_modules" />
+    <excludedPredefinedLibrary name="midi-arrays/build/js/packages/midi-arrays-test/node_modules" />
+  </component>
+</project>