Bulk rewrite of git-sonar scriptHEADmaster

Recent changes to git-sonar have made a top-to-bottom redesign and
reimplementation more approachable.  This patch is a full rewrite of
git-sonar, with a focus on simplicity and further breaking ties with
legacy git-radar stuff.  A high-level itemization of changes is below:

    - Removed shell selector options
    - Removed '-f' short option (use '--fetch')
    - Removed support for rc configuration files
    - Removed remote commits "master symbol"
    - Removed context-specific color reset codes (now always \e[0m)
    - Removed support for git-config keys (determine_default_branch)
      This is now determined automatically.

    - Added feature opt-out options
    - Added PROMPT_COLOR configuration variable

    - Configurable icons/colors are globally merged into single
      variables (the user must insert \001 and \002)
    - Configuration variables renamed from GIT_RADAR_ to GIT_SONAR_
    - Most configuration variables are renamed
    - Configuration for remote and local commits are merged together
    - Terminology "changes conflicted" is now "changes unmerged"
    - %{changes} formatter is replaced with individual stage elements
    - Unmerged status now shows A/D instead of us-vs-them

Signed-off-by: Matt Hunter <m@lfurio.us>

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