Refactor some modules + add dependency management (still WIP)

settings.gradle.kts

@@ -0,0 +1,26 @@
+pluginManagement {
+    repositories {
+        includeBuild("plugins")
+        gradlePluginPortal()
+        google()
+        mavenCentral()
+    }
+}
+dependencyResolutionManagement {
+    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
+    repositories {
+        google()
+        mavenCentral()
+        flatDir {
+            dirs("libraries/matrix/libs")
+        }
+    }
+}
+rootProject.name = "ElementX"
+include(":app")
+include(":libraries:core")
+include(":libraries:matrix")
+include(":features:login")
+include(":features:roomlist")
+include(":features:messages")
+include(":libraries:designsystem")