Refactoring I.

- Revamp whole DB to Display flow
- Filter Pipeline, arbitrary filtering and sorting
- Binary tree arrays for faster lookup & manipulation
- DB: introducing custom functions
- DB scheme: split req into heap & cache
- cache written by GlassVPN only
- heap written by Main App only
- Introducing DB separation: DBCore, DBCommon, DBAppOnly
- Introducing DB data sources: TestDataSource, GroupedDomainDataSource, RecordingsDB, DomainFilter
- Background sync: Move entries from cache to heap and notify all observers
- GlassVPN: Binary tree filter lookup
- GlassVPN: Reusing prepared statement

main/Data Source/TestDataSource.swift

@@ -0,0 +1,41 @@
+import Foundation
+
+#if IOS_SIMULATOR
+
+private let db = AppDB!
+private var pStmt: OpaquePointer?
+
+class TestDataSource {
+	
+	static func load() {
+		QLog.Debug("SQLite path: \(URL.internalDB())")
+		
+		let deleted = db.dnsLogsDelete("test.com", strict: false)
+		QLog.Debug("Deleting \(deleted) rows matching 'test.com'")
+		
+		QLog.Debug("Writing 33 test logs")
+		pStmt = try! db.logWritePrepare()
+		try? db.logWrite(pStmt, "keeptest.com", blocked: false)
+		for _ in 1...4 { try? db.logWrite(pStmt, "test.com", blocked: false) }
+		for _ in 1...7 { try? db.logWrite(pStmt, "i.test.com", blocked: false) }
+		for i in 1...8 { try? db.logWrite(pStmt, "b.test.com", blocked: i>5) }
+		for i in 1...13 { try? db.logWrite(pStmt, "bi.test.com", blocked: i%2==0) }
+		
+		db.dnsLogsPersist()
+		
+		QLog.Debug("Creating 4 filters")
+		db.setFilter("b.test.com", .blocked)
+		db.setFilter("i.test.com", .ignored)
+		db.setFilter("bi.test.com", [.blocked, .ignored])
+		
+		QLog.Debug("Done")
+		
+		Timer.repeating(2, call: #selector(insertRandom), on: self)
+	}
+	
+	@objc static func insertRandom() {
+		//QLog.Debug("Inserting 1 periodic log entry")
+		try? db.logWrite(pStmt, "\(arc4random() % 5).count.test.com", blocked: true)
+	}
+}
+#endif