Phase 0: strip JetBrains template, register Jai language and file type

- delete demo tool window + message bundle, rewrite plugin.xml metadata
- add JaiLanguage, JaiFileType, file icon, JaiTokenTypes (from the compiler's
  own lexer: modules/Jai_Lexer/module.jai)
- add ./jaitest: runs tests and reports the JUnit XML, not just the exit code
- ignore .kotlin

src/main/resources/META-INF/plugin.xml

@@ -1,33 +1,25 @@
 <!-- Plugin Configuration File. Read more: https://plugins.jetbrains.com/docs/intellij/plugin-configuration-file.html -->
 <idea-plugin>
-    <!-- Unique identifier of the plugin. It should be FQN. It cannot be changed between the plugin versions. -->
     <id>dev.hgh.intellijai</id>
 
-    <!-- Public plugin name should be written in Title Case.
-     Guidelines: https://plugins.jetbrains.com/docs/marketplace/best-practices-for-listing.html#plugin-name -->
-    <name>Intellijai</name>
+    <name>Jai</name>
 
-    <!-- A displayed Vendor name or Organization ID displayed on the Plugins Page. -->
-    <vendor url="https://www.yourcompany.com">YourCompany</vendor>
+    <vendor>hgh</vendor>
 
-    <!-- Description of the plugin displayed on the Plugin Page and IDE Plugin Manager.
-         Guidelines: https://plugins.jetbrains.com/docs/marketplace/best-practices-for-listing.html#plugin-description -->
     <description><![CDATA[
-        Enter short description for your plugin here.<br>
-        <em>most HTML tags may be used</em>
+        Support for the <b>Jai</b> programming language.<br/>
+        Syntax highlighting for <code>.jai</code> files.
         ]]></description>
 
-    <!-- Product and plugin compatibility requirements.
-         Read more: https://plugins.jetbrains.com/docs/intellij/plugin-compatibility.html -->
     <depends>com.intellij.modules.platform</depends>
 
-    <resource-bundle>messages.MyMessageBundle</resource-bundle>
-
-    <!-- Extensions defined by the plugin.
-         Read more: https://plugins.jetbrains.com/docs/intellij/plugin-extension-points.html -->
     <extensions defaultExtensionNs="com.intellij">
-        <toolWindow id="MyToolWindow" factoryClass="dev.hgh.MyToolWindowFactory"
-                    icon="AllIcons.Toolwindows.ToolWindowPalette"/>
+        <fileType
+            name="Jai"
+            implementationClass="dev.hgh.jai.JaiFileType"
+            fieldName="INSTANCE"
+            language="Jai"
+            extensions="jai"/>
     </extensions>
 
 </idea-plugin>