squash #6158 (#6160)

* move message_log_widget to game

* move files

* update headers

* fix cmakelists

* oracle fixes

* split implementation out to cpp

* fix recursive import

* fix main file

* format

cockatrice/src/interface/line_edit_completer.h

@@ -0,0 +1,29 @@
+#ifndef LINEEDITCOMPLETER_H
+#define LINEEDITCOMPLETER_H
+
+#include "../deck/custom_line_edit.h"
+
+#include <QFocusEvent>
+#include <QKeyEvent>
+#include <QStringList>
+
+class LineEditCompleter : public LineEditUnfocusable
+{
+    Q_OBJECT
+private:
+    QString cursorWord(const QString &line) const;
+    QCompleter *c;
+private slots:
+    void insertCompletion(QString);
+
+protected:
+    void keyPressEvent(QKeyEvent *event);
+    void focusOutEvent(QFocusEvent *e);
+
+public:
+    explicit LineEditCompleter(QWidget *parent = nullptr);
+    void setCompleter(QCompleter *);
+    void setCompletionList(QStringList);
+};
+
+#endif