replaced appointment.hash by appointment.slug, incooperated slug column into appointments table

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

de.srsoftware.cal.app/README.md

@@ -0,0 +1,13 @@
+Notiz an mich selbst:
+
+DB-Export auf Server:
+
+`mysqldump -u root -p --result-file occ.sql --default-character-set=latin1 opencloudcal`
+
+Patchen:
+
+`sed -i 's/latin1/utf8mb4/g' occ.sql`
+
+Import im lokalen Docker:
+
+`mysql -u root -p opencloudcal < /var/lib/mysql/occ.sql`

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

@@ -7,5 +7,5 @@ dependencies {
 
     implementation("de.srsoftware:configuration.api:1.0.0")
     implementation("de.srsoftware:configuration.json:1.0.0")
-    implementation("de.srsoftware:tools.util:1.1.1")
+    implementation("de.srsoftware:tools.util:1.2.1")
     implementation("com.mysql:mysql-connector-j:9.1.0")}