logic: Added update checker connecting to online API

* connects to https://www.sourcetrail.com/api/v1/versions/latest
* sends information about OS, platform, license type, current version and a unique user token
* Automatic update check is enabled via Startscreen and performed once every 24 hours on window focus
* Update check can be forced by clicking on "check for new version" on start screen
* renamed TimePoint to TimeStamp

fortune cookie message = In Träumen und im Leben ist nichts unmöglich.

src/lib/data/storage/PersistentStorage.cpp

@@ -10,7 +10,7 @@
 #include "utility/messaging/type/MessageNewErrors.h"
 #include "utility/messaging/type/MessageStatus.h"
 #include "utility/text/TextAccess.h"
-#include "utility/TimePoint.h"
+#include "utility/TimeStamp.h"
 #include "utility/tracing.h"
 #include "utility/utility.h"
 

src/lib/data/storage/StorageStats.h

@@ -1,7 +1,7 @@
 #ifndef STORAGE_STATS_H
 #define STORAGE_STATS_H
 
-#include "utility/TimePoint.h"
+#include "utility/TimeStamp.h"
 
 struct StorageStats
 {
@@ -20,7 +20,7 @@ struct StorageStats
 	size_t completedFileCount;
 	size_t fileLOCCount;
 
-	TimePoint timestamp;
+	TimeStamp timestamp;
 };
 
 #endif // STORAGE_STATS_H

src/lib/data/storage/sqlite/SqliteStorage.cpp

@@ -1,7 +1,7 @@
 #include "data/storage/sqlite/SqliteStorage.h"
 
 #include "utility/logging/logging.h"
-#include "utility/TimePoint.h"
+#include "utility/TimeStamp.h"
 
 SqliteStorage::SqliteStorage(const FilePath& dbFilePath)
 	: m_dbFilePath(dbFilePath.canonical())
@@ -127,12 +127,12 @@ bool SqliteStorage::isIncompatible() const
 
 void SqliteStorage::setTime()
 {
-	insertOrUpdateMetaValue("timestamp", TimePoint::now().toString());
+	insertOrUpdateMetaValue("timestamp", TimeStamp::now().toString());
 }
 
-TimePoint SqliteStorage::getTime() const
+TimeStamp SqliteStorage::getTime() const
 {
-	return TimePoint(getMetaValue("timestamp"));
+	return TimeStamp(getMetaValue("timestamp"));
 }
 
 void SqliteStorage::setupMetaTable()

src/lib/data/storage/sqlite/SqliteStorage.h

@@ -7,7 +7,7 @@
 #include "utility/file/FilePath.h"
 
 class SqliteStorageMigration;
-class TimePoint;
+class TimeStamp;
 
 class SqliteStorage
 {
@@ -43,7 +43,7 @@ public:
 	bool isIncompatible() const;
 
 	void setTime();
-	TimePoint getTime() const;
+	TimeStamp getTime() const;
 
 protected:
 	void setupMetaTable();