Fast-Syntax-Highlighting _adaptive_ Git support

[Sebastian Gniazdowski <sgniazdowski@xxxxxxxxx>]

Hello,
the new Git support in F-Sy-H is **adaptive** – despite being
specific-command oriented (like it was before). This means that not
only the highlighting detects Git specifics and e.g. verifies if the
entered tag or branch is correct, but also that it changes the
expected command syntax on-the-fly, according to the options entered.

For example git fetch --multiple gets only a series of repository
names, not a single repository name and a series of refspecs like it
does normally.

This allows to verify the correctness of the entered git command even
before executing it. Little implementation background – all this is
based on an abstract definitions with a custom syntax, in general no
code has to be written (only basic callbacks).

Asciinema screencast of the feature: https://asciinema.org/a/253411

-- 
Sebastian Gniazdowski
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