Add a filter to the project browser

[peter-b]

When working with large numbers of stacks in the project browser (or when gRevDevelopment is enabled), it can often be (very) hard to find a particular stack/substack/control.

Please add a filter field -- perhaps like the filter field at the bottom of the project tree view in Xcode -- that narrows down the items shown in the project browser to those that match the specified filter text and their parents.

[livecodesam]

Enhancement not implemented as of 8.1.6