Enable deferring tags file registration (VimEnter)

By default the plug-in initializes the &tags option as soon as possible
so that the global tags file is available when using "vim -t some_tag".
If you don't use "vim -t" and want to defer registering the global tags
file until the interface has been initialized you can now set the global
variable g:easytags_register_late = 1.

This commit is based on a pull request from Daniel Hahler, I added the
option to enable either mode of initialization (I guess Daniel doesn't
use "vim -t some_tag", but I certainly do :-). Here's the original
commit message:

    Move calling RegisterTagsFile to `au VimEnter`.

    Calling RegisterTagsFile on VimEnter instead of when including the
    plugin appears to make it behave better when (re)setting 'tags' in
    vimrc.

    I do not remember if this is related to using tplugin only.

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