Extend text editor tooltips by a 'widget content', making
it possible to show any widget utilizing the fact that the
QTipLabel actually is a frame (and thus a container).
Introduce concept of 'interactive' tooltips and modify
the tooltip-closing mechanism such that simple interaction
is possible. Emit the base text editor's tooltip signals
with the correct position and add API to calculate the tooltip
position from the cursor position.
Add API for pinning tooltips to the text editor (by removing
them from the QTipLabel layout).
Modify the Debugger's tooltipmanager not to manage tooltips
under TextEditor control and to take over control only once
tooltips are pinned.

Rubber-stamped-by: Leandro T. C. Melo <leandro.melo@nokia.com>

There seems to be no reason not to allow this outside of the observer
mode.

Reviewed-by: Tobias Hunger

The problem was that several lookup calls suddenly failed because
the actual QML types were no longer in the default scope chain. However,
the QML documentation says the type names are in the scope.

Also, 'MyComponent.' in a JS-expression context only showed the attached
properties of MyComponent and missed the enums.

With this change completion now may offers too many options, but that's
better than missing some.

This reverts parts of 490f2797

Reviewed-by: Leandro Melo

This change is correct. GCC wrongly accepted S60CertificateExtension
as covariant with Botan::Certificate_Extension even though the base
was inaccessible.

Reviewed-By: dt

Reviewed-by: con

This allows us to compile without -nostdlib, which is causing a lot of
issues.

Reviewed-By: hjk

Adds a clear button when text is entered.

Introduce CompletionPolicy enum, use 'TextCompletion' for the new plain
text completion, and 'SemanticCompletion' or 'QuickFixCompletion' for
the existing cases.

Reviewed-by: Erik Verbruggen

Use camel case for library name all over the place.

The chooser allows choosing variables from a list, and inserting them
into previously focused line edit, text edit, or plain text edit.
Variables are now registered with a description in the variable manager.
Also make the QT_INSTALL_BINS --> CurrentProject:QT_INSTALL_BINS for
consistency.

It's done via a external tool description now.

This overrides ordering of *all* tools. Which is suboptimal.

Reordering isn't persistently saved yet.

Because otherwise implementing drag&drop is impossible.

Adding new categories is not there yet though, neither is moving tools
through the categories.

Not possible to reset them yet.
Saves the change in the settings instead of writing new tools xml files.
This probably needs to be adapted for tools that are "local" from the
beginning.

No editing possible yet.

It now follows quoting rules.