Fix different coding/C++ issues

[iakov]

No description provided.

[todo]

Fix design error. This slot is called on wrong thread (probably)

trikRuntime/trikScriptRunner/src/scriptThread.cpp

Lines 88 to 92 in 9b5cfb9

	// TODO: Fix design error. This slot is called on wrong thread (probably)
	// mEngine must be accessed from the correct worker thread instead
	void ScriptThread::onGetVariables(const QString &propertyName)
	{
	if (mEngine != nullptr) {

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This comment was generated by todo based on a TODO comment in 9b5cfb9 in #568. cc @iakov.