chore: move plugin stuff back into separate subproject

Putting it in the root project breaks the devkit plugin

build.gradle.kts

@@ -38,9 +38,11 @@ val clionVersion = properties("clionVersion").get()
 val clionPlugins = listOf("com.intellij.clion", "com.intellij.cidr.lang", "com.intellij.cidr.base", "com.intellij.nativeDebug")
 
 val lsp4jVersion = "0.21.1"
-val lsp4ijVersion = "0.0.2"
+val lsp4ijVersion = "0.3.0-20240702-174041"
 
-val lsp4ijDepString = "${if (lsp4ijVersion.contains("-")) "nightly." else ""}com.jetbrains.plugins:com.redhat.devtools.lsp4ij:$lsp4ijVersion"
+val lsp4ijNightly = lsp4ijVersion.contains("-")
+val lsp4ijDepString = "${if (lsp4ijNightly) "nightly." else ""}com.jetbrains.plugins:com.redhat.devtools.lsp4ij:$lsp4ijVersion"
+val lsp4ijPluginString = "com.redhat.devtools.lsp4ij:$lsp4ijVersion${if (lsp4ijNightly) "@nightly" else ""}"
 
 val lsp4ijDep: DependencyHandler.() -> Unit = {
     intellijPlatformPluginDependency(lsp4ijDepString)
@@ -138,7 +140,6 @@ allprojects {
                 dependsOn("generateGrammars")
             }
         }
-
     }
 
     configure<JavaPluginExtension> {
@@ -187,6 +188,9 @@ project(":zig") {
     dependencies {
         implementation(project(":common"))
         lsp4ijDep()
+        intellijPlatform {
+            plugin(lsp4ijPluginString)
+        }
     }
     tasks {
         generateLexer {
@@ -246,7 +250,9 @@ project(":zon") {
     }
 }
 
-dependencies {
+project(":plugin") {
+    dependencies {
+        implementation(project(":common"))
         implementation(project(":zig"))
         implementation(project(":project"))
         implementation(project(":zon"))
@@ -254,15 +260,11 @@ dependencies {
         intellijPlatform {
             zipSigner()
             pluginVerifier()
-        when (baseIDE) {
-            "idea" -> intellijIdeaCommunity(ideaVersion)
-            "clion" -> clion(clionVersion)
+            plugin(lsp4ijPluginString)
         }
-        plugin("com.redhat.devtools.lsp4ij:$lsp4ijVersion")
     }
-}
 
-intellijPlatform {
+    intellijPlatform {
         pluginConfiguration {
             name = properties("pluginName")
             description = providers.fileContents(rootProject.layout.projectDirectory.file("README.md")).asText.map {
@@ -300,13 +302,13 @@ intellijPlatform {
                 ide(IntelliJPlatformType.CLion, clionVersion)
             }
         }
-}
+    }
 
-// Include the generated files in the source set
+    // Include the generated files in the source set
 
-// Collects all jars produced by compilation of project modules and merges them into singe one.
-// We need to put all plugin manifest files into single jar to make new plugin model work
-val mergePluginJarTask = task<Jar>("mergePluginJars") {
+    // Collects all jars produced by compilation of project modules and merges them into singe one.
+    // We need to put all plugin manifest files into single jar to make new plugin model work
+    val mergePluginJarTask = task<Jar>("mergePluginJars") {
         duplicatesStrategy = DuplicatesStrategy.FAIL
         archiveBaseName.set("ZigBrains")
 
@@ -333,9 +335,9 @@ val mergePluginJarTask = task<Jar>("mergePluginJars") {
         doLast {
             delete(pluginJars)
         }
-}
+    }
 
-tasks {
+    tasks {
         runIde {
             dependsOn(mergePluginJarTask)
             enabled = true
@@ -370,16 +372,27 @@ tasks {
         buildPlugin {
             enabled = true
         }
+    }
+}
 
+tasks {
     generateLexer {
         enabled = false
     }
-
     generateParser {
         enabled = false
     }
 }
 
+dependencies {
+    intellijPlatform {
+        when (baseIDE) {
+            "idea" -> intellijIdeaCommunity(ideaVersion)
+            "clion" -> clion(clionVersion)
+        }
+    }
+}
+
 fun distFile(it: String) = layout.buildDirectory.file("dist/ZigBrains-${pluginVersion().get()}-$it-signed.zip")
 
 publishVersions.forEach {