first implementation of cal.db, that

- successfully connects to db
- updated db sheme
- succeeds in listing appointments

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

de.srsoftware.cal.importer/build.gradle.kts

@@ -2,7 +2,8 @@ description = "OpenCloudCal : Importers"
 
 dependencies {
     implementation(project(":de.srsoftware.cal.api"))
+    implementation(project(":de.srsoftware.cal.base"))
     implementation("de.srsoftware:tools.optionals:1.0.0")
-    implementation("de.srsoftware:tools.util:1.1.3")
+    implementation("de.srsoftware:tools.util:1.2.0")
     implementation("de.srsoftware:tools.web:1.3.3")
 }