Navigation in the blame committer list when double clicking

(like in the blame file area on the right...)
and fix a bug where the contains of the blame committer list disappeared
Update GitPlugin icons
Encrypt the data for the build server credentials.
Merge remote-tracking branch 'gitextensions/master' into BuildServerIntegration-plugin
Update GitExtensionsShellEx icons (also fixed the IconResetFileTo.ico, now red, was blue). Improve RevisionCheckout icon.
Merge pull request #1649 from pmiossec/correct_blame_doubleclick

Navigation in the blame committer list when double clicking
fixed ico files to "3.00 format" (with IcoCur.dll / Paint.NET)
FormChooseCommit: double click behaves like OK button instead of opening the CommitInfo dialog. (RevisionGrid: add option not to show the CommitInfo dialog. Add event for double click a revision)
Merge pull request #1681 from feinstaub/topic_choose_commit_dlg

FormChooseCommit: double click behaves like OK button instead of opening the CommitInfo dialog
Merge pull request #1680 from feinstaub/topic_create_tagdialog

Remove old Create tag dialog and related changes
Navigation in the blame committer list when double clicking

(like in the blame file area on the right...)
and fix a bug where the contains of the blame committer list disappeared

Conflicts:
	GitUI/UserControls/BlameControl.cs
SettingsDialog: fix compiler warning
SettingsPage: remove Obsolete attribute from _loadingSettings, add property IsLoadingSettings.
ChecklistSettingsPage: fix compiler warning
ChecklistSettingsPage: remove obsolete property ChecklistSettingsPage and fix depending code
PluginSettingsPage: fix compiler warning
FormSettings: move the Checklist SettingsPage one level up.

The Checklist is now shown when the "Git Extensions" root node is selected.
(Before, selecting "Git Extensions" caused the treeview to "snap" to the first subnode)
FormSettings: add a Page with introductory text as the Plugin Settings root.
CreateTag dialog: cancel should not refresh the revision grid
CommitPickerSmallControl: SetSelectedCommitHash shows message box if manually entered commit hash is not correct