Use QGridLayout to align header label and QStackedLayout for the pages
(in code, as it is not available in Designer).
Derive new class FilterLineEdit for filter widgets based on a modified
version of FancyLineEdit and use that in settings.
Rubber-stamped-by: con <qtc-committer@nokia.com>
Task: 241959, 248085
RevBy: Optics/Naming checked by con
Details: Give IOptionPage an id() to differentiate from trName(). Make showOptionsDialog return a bool (applied) and give it an optional parent. Change Cpp and form class wizards, give them a Configure... button to change those settings.
