Enabling other plugins to know which tasks currently exist.

Fixes the performance of large find scope selections. Try
Ctrl+A Ctrl+F in a large file and scroll.

See Qt Merge-request: 727, change a9c8decc741d8c2b340f38d7a854ef206672ab3e,
which makes wchar_t a native type. QString::toUtf16() no longer is
a WCHAR.

Users can still go to plugin manager and manually enable the plugin.

Reviewed-by: con

Task-number: QTCREATORBUG-1765
Reviewed-by: ck

StringBuilder problems ...

image providers to supply pixmaps so that the Image::source property can be
used instead.

Reviewed-by: kkoehne

Reviewed-by: Christian Kamm
(cherry picked from commit 3281a9e6)

Reviewed-by: con

The remote terminal likes to insert backspaces just for fun.

Note to the merge person: This commit might trigger a merge conflict.
In that case, just use the code from the master branch.

Disable the spinboxes once we disable packaging.

Reviewed-by: ck

Previously it would always jump to the start of the document, since
that's where the newly created text cursor is at the beginEditBlock
call. Avoid this when saving the current editor by starting with the
cursor of the editor.

Reviewed-by: mae
Task-number: QTCREATORBUG-1807

As a custom icon is set in most cases anyway.

Reviewed-by: Robert Loehning <robert.loehning@nokia.com>

If we where not in full help mode at least once, the engine
would still run without valid help collection due to the new
lazy initialisation, thus the right side pane would not be
able to retrieve the requested help file.

Reviewed-by: ck

(cherry picked from commit 7ccf903ee3d9da4a104310ed423130857d59d91b)

(cherry picked from commit 2b40e2906fc070c6253a84c0ca507ff0db912f73)

(cherry picked from commit 474ec252a23745bf5106b239054c17d7dfc2fbf2)

(cherry picked from commit 3eb7b6bfbde6a847154c6053e7b4171554207865)

Task-number: QTCREATORBUG-1790
Reviewed-by: dt
Reviewed-by: mae

Task-number: QTCREATORBUG-1405
Reviewed-by: dt

(cherry picked from commit cbdd9202)

(cherry picked from commit 2e09a8f4)

(cherry picked from commit d3cea8a4)

Similar to what we do in the find tool bar.

Task-number: QTCREATORBUG-1543

Task-number: QTCREATORBUG-1631

Thus icons are displayed in a uniform size and don't waste too much space.

Task-number: QTCREATORBUG-1539