gitk: use headoutlinecolor, headbgcolor, and tagfgcolor config settings to change the color of the tags and head outlines and fill

[MagmaiKH]

This patch makes the config settings, headoutlinecolor and tagfgcolor, work.
These are existing config settings but not used in the code.

(I noticed that tagfgcolor was not working while making an extension for vscode that exports its color theme to gitk.)
(Upon review of the code I found that headoutlinecolor was also not used and investigated and fixed it.)

This simple patch has them affect the target UI elements while drawing refs and their outlined boxes.
Tags are drawn in their own code branch then heads and non-heads are drawn in another one.
Because both head and non-head refs are drawn in the same loop the colors used to draw (and fill) toggle between the head colors and (still hard-coded) non-head ref colors.

Image showing it working, reviewing the patch that made it work.

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[gitgitgadget]

There are issues in commit 3c592f2:
gitk: use headoutlinecolor, headbgcolor, and tagfgcolor config settings to change the color of the tags and head outlines and fill

• First line of commit message is too long (> 76 columns)
• Lines in the body of the commit messages should be wrapped between 60 and 76 characters.
  Indented lines, and lines without whitespace, are exempt

[gitgitgadget]

There is an issue in commit ddbbd74:
gitk: use config settings for head/tag colors

• Lines in the body of the commit messages should be wrapped between 60 and 76 characters.
  Indented lines, and lines without whitespace, are exempt