User can now define any number of init functions for a project, by
writing multiple Init commands, just like Callback works. They will be
called sequentially in the same order they are defined:

    Project 'path', 'ProjectName'
    Init    'ProjectName', 'FirstFunction'
    Init    'ProjectName', 'SecondFunction'

will result in

    (...) | call FirstFunction('ProjectName') | call SecondFunction('ProjectName') (...)

execution when project is opened.

This only works if g:project_enable_welcome is set to 1.