Dev menus added. Refs: #80.
as proposed in CPC 1.7 rc6 with the following modifications:
1. key 'Clear Log' was not unique, so I changed it in the menu to 'ClearLog'.
2. The keys starting with 'Ctls' don't belong to Dev but to the CPC package Ctls, so they have been removed.

Signed-off-by: Josef Templ <josef.templ@gmail.com>