- make pick scenes always use particularly thick lines so that the line picking behavior is relayed to the mouse-over highlight

- use a faster ID choosing setup, this should work so long as nobody goes to create 17 million objects

- hopefully stabilized the entire shared pointers deal now

- improved shared pointer behavior, still not there yet

- initial overhaul with smart pointers

- slight refactor in ldobject methods

- renamed some renderer members

- crashcatcher: hide the main window before doing anything and also write the crashlog into a file

- when an object is deleted, if it's the renderer's object-under-cursor the field needs to be cleared or ldforge crashes

- grid-snap the drawn circle radius, not the point used for the distance calculation

- added a macro for adding operator++ and operator-- to enums, less cast hell this way

- significantly sped up selecting all objects, it is now an actually fast operation

- made the mouse-hover object highlight togglable from configuration

- added a selection hover effect to the renderer. selecting objects just became a lot more convenient...

- cut unnecessary code from MainWindow::updateSelection. speeds it up a bit, especially when unselecting but it's not fast enough to my tastes yet

- overhauled configuration setup a bit: configuration entries renamed and are now in a cfg:: namespace

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