New end_messages method

The new end_messages function allows you to create status messages that will be printed at the end of the Meson run rather than immediately. For example the following setup:

end_message('A short name:', 'value #1')
end_message('A bit longer name:', 'value #2')

Will cause the following text to be printed as the last thing just before Meson exits.

Main project

A short name:       value #1
A bit longer name:  value #2