Change-Id: I8b73d583be1ee7183f4074bce49d5390e38631a2

there only two classes of files anyway: regularly editable ones which may
ask for interaction, and "background" files which always operate silently.
the regular case is the more complex one, so put that into the base class.

add/unify read error handling in all affected classes

this centralizes error reporting (in fact, in most cases it adds any in
the first place).

Task-number: QTCREATORBUG-1619

Reviewed-by: con

Reviewed-by: hjk

... instead of running a sed script over a lot of files on each
version increment.

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.

Merge-request: 177
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>

Fix README, some spelling errors, remove contractions,
exclamation marks, correct some plural forms, join split messages.
Add QCoreApplication::translate to non-Q_OBJECT-classes.
Fix some lupdate warnings about discarding meta-data (//:).

Do not include qtcreator.pri from _dependencies.pri

A mostly mechanical change.

Reviewed-By: con

Merge-request: 2165
Reviewed-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>

Merge-request: 2165
Reviewed-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>

Merge-request: 2165
Reviewed-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>

Merge-request: 2165
Reviewed-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>

Merge-request: 2165
Reviewed-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>

Merge-request: 2165
Reviewed-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>

Merge-request: 2165
Reviewed-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>