DB: remove shared stuff, add singleton

Add Config class

source/config.d

@@ -0,0 +1,21 @@
+module config;
+
+import std.json;
+import std.file;
+
+import slf4d;
+
+class Config {
+  JSONValue v;
+  private string m_path;
+
+  this(string path = "./config.json") {
+    this.m_path = path;
+  }
+
+  void load() {
+    debugF!"Trying to load config from %s"(this.m_path);
+    string contents = readText(this.m_path);
+    this.v = parseJSON(contents);
+  }
+}