Clean icore.h.

text on top of seach results on top of find scope on
top of ifdefed out lines.

- Unexport Core::Internal::MainWindow and remove its includes.
- Move RssFetcher from Core::Internal to Core.
- Unexport CopyTaskHandler.
- Move TextEditor's completion support and Refactor Overlay
  helper classes from TextEditor::Internal to TextEditor as they
  are exported.
- Move internal BaseTextBlockSelection into private header.
- Unexport TextEditorOverlay as they are not used.

qtLibraryTarget is only defined if used with TEMPLATE=lib, which makes
it fail in pri files that are used for app pro files. The tests still
don't run because of run time linking issues.

Reviewed-by: con

Fix 722e48c2.

Remove internal markers from exported headers,
introduce private class for BaseTextDocument.

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

TextEditor will now recognize an UTF-8 BOM.

A setting to determine what to do on saving has been added as well - the
options are "Always Add", "Keep Already Present" and (mostly for
completeness) "Always Delete".
Note: if encoding is "System", "Always Add" doesn't work, because there
is no API to know what the System encoding is.

Task-number: QTCREATORBUG-1857

Merge-request: 2180
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>

(default).

Merge-request: 201
Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>

Didn't work if a project specific encoding was set.

Task-number: QTCREATORBUG-65
Reviewed-by: Robert Loehning

There was an off-by-one error for the normal find scope.
Improved look by ignoring the left side.

This caused it to go to 0 when for example displaying size 9 at 10%,
which is an invalid value so it caused the text to revert back to the
default size.

It also caused zooming to sometimes appearing to have no effect. For
example zooming size 9 to 110% would still yield size 9 rather than 9.9.

Task-number: QTCREATORBUG-2744
Task-number: QTCREATORBUG-2745
Reviewed-by: Robert Loehning
Reviewed-by: hjk

Reviewed-by: Leandro Melo
Reviewed-by: hjk

Reviewed-by: dt <qtc-committer@nokia.com>
Reviewed-by: ossi <oswald.buddenhagen@nokia.com>
Task-number: QTCREATORBUG-688

Example situation: The plain text editor is displaying in-memory content and
has not been explicitly "configured". If there's an attempt to indent the text
it crashes since the indenter is invalid. This can happen if one clicks on 'Show
View Contents in Editor' within a debug session and press enter in the editor.

Reviewed-by: con

Reviewed-by: con

Task-number: QTCREATORBUG-65

Also some const correctness.

Moving the logic out of BaseTextDocument for use at other places.

Reviewed-by: con

Reviewed-by: ckamm

Reviewed-by: hjk
Reviewed-by: Erik Verbruggen

Currently used by the QML outline and C++ type hierarchy.

Reviewed-by: kkoehne
Task-number: QTCREATORBUG-2583

Reviewed-by: hjk
Reviewed-by: dt
Task-number: QTCREATORBUG-2038

Should have been done earlier. 2.1.80 was burned in the pre-2.1.0->2.0.1
days, and we'd like to have odd subminor for 'working' and even subminor
numbers for pure cherry-picking release branches anyway.

The generic highlighter already provided a method for this.
This method was then lifted to the base syntax highlighter
and it is now used by the profile highlighter.

Reviewed-by: Roberto Raggi
Task-number: QTCREATORBUG-2448

Now the plain text editor only tries to apply a highlight configuration
if the MIME type passed is valid. Otherwise, it should behave as an ordinary
trivial editor and should not miss a highlight definition.

There was an off-by-one error for the normal find scope.
Improved look by ignoring the left side.

It was refusing to stay at index 0.

Task-number: QTCREATORBUG-2472
Reviewed-by: Erik Verbruggen