This removes the all hard dependencies to and from welcome screen,
except the one to the core plugin. More in detail:

- Add IWelcomePage to add a tab to the welcome screen
- Move tabs in the modules where they belong
- Enables QHelpManager to open help fullscreen and contextually
- "Getting Started" moves to Qt4ProjectManager
- Projects & Sessions (aka "Develop") moves to ProjectExplorer
- "Community" remains in the welcome plugin for simplicity

Just one qmakestep is allowed though. But I you can add as many
makesteps as you want.

Move WelcomeModeTreeWidget to utils, add d-ptr.

... by creating a default run configuration.

- created protocol class as basis for different paste servers
- removed custom classes and replaced functionality with
  simple QHttp* usage
- removed poster and fetcher classes copied from cpaster
  application. It not getting updated anyways in creator
- Known issue: Listing does not update, when user changes
  protocol
- TODO: add pastebin.ca support. Code is done already, just
  needs to be placed inside plugin.

Thiago changed the way buildkeys are parsed, thus to reintroduce the
patched plugin loader, the changes to the build parser must be ported to
the patched plugin loader. Or the patches to make the plugin loader
faster to the current state of the qt plugin loader.

Task-number: 257868
	Reviewed-by: kh

Do not add all image paths (from different projects), keep a
base path and add current.

Removing the last project did set startupproject to zero and unloaded
the project. Thus the check that the project for the current item and
the startup project are both null and the same.

Also fix a small bug with the import label.

Session Management

Reviewed-By: TrustMe

Still work in progress, though.

On the Project Mode. Might fix a bug hjk found, which i can't reproduce.

reorder .pri includes to ensure relevant -L flags appear before the -l
flags which need them

Reviewed-by: Daniel Molkentin

Fixes a designer integration issue.
Task-Nr: 258315

The selection was not visible when moving cursor up.

Reviewed-by: hjk

Merge-request: 1016
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@nokia.com>