Global code ovehaul - remove CAS and other, add 15 minute greet check

- Remove CAS, as it no longer works for us
- Remove other checks
- Implement 15 minute greet timeout check
- Fix chat logos
- Ditch thirdparty logger, use stdlib log facility wrapper for logging

vendor/github.com/NicoNex/echotron/v3/smap.go

@@ -0,0 +1,26 @@
+package echotron
+
+import "sync"
+
+type smap[K comparable, V any] sync.Map
+
+func (s *smap[K, V]) load(key K) (val V, ok bool) {
+	v, ok := (*sync.Map)(s).Load(key)
+	if !ok {
+		return
+	}
+	return v.(V), ok
+}
+
+func (s *smap[K, V]) store(key K, val V) {
+	(*sync.Map)(s).Store(key, val)
+}
+
+func (s *smap[K, V]) loadOrStore(key K, val V) (actual V, loaded bool) {
+	a, loaded := (*sync.Map)(s).LoadOrStore(key, val)
+	return a.(V), loaded
+}
+
+func (s *smap[K, V]) delete(key K) {
+	(*sync.Map)(s).Delete(key)
+}