Create RC database layer

rc_database/src/schema/mod.rs

@@ -0,0 +1,17 @@
+pub mod user;
+pub mod user_aux;
+pub mod permissions;
+pub mod garage;
+pub mod campaign;
+pub mod campaign_difficulty_completion;
+pub mod common_query;
+
+pub fn parse_int_csv(s: &str) -> Vec<u32> {
+    s.split(',').filter_map(|i_as_s| {
+        i_as_s.parse().ok()
+    }).collect()
+}
+
+pub fn dump_csv<T: std::string::ToString>(slice: &[T]) -> String {
+    itertools::Itertools::intersperse(slice.iter().map(|x| x.to_string()), ",".to_owned()).collect()
+}