Massive architectural rework

This commit massively overhauls the project's structure to simplify
development. Most parts are now correctly compartmentalized and
dependencies are passed in a sane way rather than global variables
galore xd.

internal/util/typedmap.go

@@ -0,0 +1,30 @@
+package util
+
+import "sync"
+
+type TypedMap[K comparable, V any] struct {
+	internal sync.Map
+}
+
+func (m *TypedMap[K, V]) Load(key K) (V, bool) {
+	val, ok := m.internal.Load(key)
+	if !ok {
+		var zero V
+		return zero, false
+	}
+	return val.(V), true
+}
+
+func (m *TypedMap[K, V]) Store(key K, value V) {
+	m.internal.Store(key, value)
+}
+
+func (m *TypedMap[K, V]) Delete(key K) {
+	m.internal.Delete(key)
+}
+
+func (m *TypedMap[K, V]) Range(f func(key K, value V) bool) {
+	m.internal.Range(func(k, v any) bool {
+		return f(k.(K), v.(V))
+	})
+}