Add API server using KTor

* Change ViewModels to Singletons
* Add KTor server in APIHandler
* Add API routes for celldata
  * /cells and /cell/id API that return json-serialized CellData
* Adapt UI symbols for server status
* Adapt APIStatus layout

Author: bastian-src

.idea/kotlinc.xml

@@ -1,6 +1,7 @@
 plugins {
     alias(libs.plugins.androidApplication)
     alias(libs.plugins.jetbrainsKotlinAndroid)
+    alias(libs.plugins.jetbrainsKotlinPlugin)
 }
 
 android {
@@ -48,6 +49,12 @@ android {
             }
         }
     }
+    packaging {
+        resources {
+            excludes += "META-INF/INDEX.LIST"
+            excludes += "META-INF/io.netty.versions.properties"
+        }
+    }
 }
 
 dependencies {
@@ -65,7 +72,15 @@ dependencies {
     implementation(libs.androidx.lifecycle.livedata.ktx)
     implementation(libs.androidx.lifecycle.viewmodel.ktx)
     implementation(libs.androidx.fragment.ktx)
+    implementation(libs.androidx.lifecycle.service)
     testImplementation(libs.junit)
     androidTestImplementation(libs.androidx.junit)
     androidTestImplementation(libs.androidx.espresso.core)
-}
+
+    // Ktor
+    implementation(libs.ktor.server.netty)
+    implementation(libs.ktor.server.core)
+    implementation(libs.ktor.server.request.validation)
+    implementation(libs.ktor.server.content.negotiation)
+    implementation(libs.ktor.serialization.kotlinx.json)
+}