modified GitHead parse;

Consider the case where a tag is named "refs/heads/some-tag". This
case is unlikely, but it may cause ill side-effects because it'll
be parsed as both a Head and a Tag. "refs/tags/refs/heads/some-tag".
Removed variable ExcludedFiles.
Merge pull request #1715 from bergerjac/prs/GitHead

modified GitHead parse
PluginRootIntroductionPage: remove "IsInstantSavePage: true"
SettingsPageBase: return also TextBox and ComboBox Text value to be found the the search
GitPlugin: save icons with 24bit
FormGoToCommit: fix help link and simplify label text
FormChooseCommit: add button that opens the Go to commit dialog that helps to find a specific commit
Merge pull request #1721 from feinstaub/topic_pluginicons

GitPlugin: save icons with 24bit
Merge pull request #1718 from feinstaub/topic_fix_pluginintrosettingspage

PluginRootIntroductionPage: remove "IsInstantSavePage: true"
Merge pull request #1720 from feinstaub/topic_settingspage_search

Settings dialog: also find text from TextBoxes and Comboboxes
Merge pull request #1722 from feinstaub/topic_minor_gotocommitfix

FormGoToCommit: fix help link and simplify label text
Merge pull request #1723 from feinstaub/topic_gotocommit_in_choosecommitdlg

FormChooseCommit: add button that opens the Go to commit dialog that helps to find a specific commit
Merge remote-tracking branch 'gitextensions-pombeiro/BuildServerIntegration' into BuildServerIntegration
Merge remote-tracking branch 'gitextensions/master' into BuildServerIntegration