Initial commit: nimforum with BaraDB backend

- Replaced SQLite with BaraDB via TCP wire protocol
- Added baradb_client.nim and baradb_sqlite.nim adapter
- Renamed SQL keywords: status->usrStatus, key->sessionKey, like->postLike
- Added NOW() support for datetime defaults
- Switched Jester to asynchttpserver (-d:useStdLib) to avoid thread/GC issues
- Frontend built and favicon added

config.nims

@@ -0,0 +1,4 @@
+# begin Nimble config (version 2)
+when withDir(thisDir(), system.fileExists("nimble.paths")):
+  include "nimble.paths"
+# end Nimble config