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.
Details: These classes replace a number of classes with differing
interfaces by just one class. The design isn't quite perfect, but a lot
better than what it used to be. Also moved the ToolChain classes to the
projectexplorerm so that eventually the cmake plugin can also use them.
Details: That hasn't worked in the last few months, since we changed
the QtVersion class from being passed by value to being passed around by
reference.
The previous interface wasn't sufficient to properly support the Apply
button, since it didn't separate applying the changes from the cleanup
phase.
Designer settings pages still need some fixing.
Fixes Apply button causing problems for certain plugins, for example the
QuickOpen.
