Snippets: Make it easier for plugins to add snippets groups

Groups are no longer enum values but identified from snippet providers.

src/plugins/texteditor/snippets/snippet.cpp

@@ -37,7 +37,8 @@ using namespace TextEditor;
 
 const QChar Snippet::kVariableDelimiter(QLatin1Char('$'));
 
-Snippet::Snippet(const QString &id) : m_isRemoved(false), m_isModified(false), m_id(id)
+Snippet::Snippet(const QString &groupId, const QString &id) :
+    m_isRemoved(false), m_isModified(false), m_groupId(groupId), m_id(id)
 {}
 
 Snippet::~Snippet()
@@ -48,6 +49,11 @@ const QString &Snippet::id() const
     return m_id;
 }
 
+const QString &Snippet::groupId() const
+{
+    return m_groupId;
+}
+
 bool Snippet::isBuiltIn() const
 {
     return !m_id.isEmpty();
@@ -103,16 +109,6 @@ bool Snippet::isModified() const
     return m_isModified;
 }
 
-void Snippet::setGroup(Group group)
-{
-    m_group = group;
-}
-
-Snippet::Group Snippet::group() const
-{
-    return m_group;
-}
-
 QString Snippet::generateTip() const
 {
     static const QLatin1Char kNewLine('\n');