537217: [C++17] Add support for typename keyword for template template parameters

This patch allows for the 'typename' keyword to be used in
template-template template parameter declarations. Additionally, this
patch also fixes an issue in the writer, which caused the ellipsis in
variadic template-template template parameter declaration to be dropped.

Change-Id: I8f68e6053b2b8848b35d1cf6d25d7f4b5b9d396d
Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=537217
Signed-off-by: Felix Morgner <fmorgner@hsr.ch>
9 files changed