customize how unread containing maildirs are shown

this introduces 2 faces: mu4e-maildirs-extension-unread-face (inheriting mu4e-unread-face) and mu4e-maildirs-extenion-header-face (inhriting mu4e-header-face), that can be customized to set how unread-containing maildirs are shown in summary.

Signed-off-by: Niv Sardi <xaiki@evilgiggle.com>
rename mu4e-maildirs-extension-header-face to mu4e-maildirs-extension-maildir-face

Signed-off-by: Niv Sardi <xaiki@evilgiggle.com>
go back to propertizing the unread part of the maildir line

Signed-off-by: Niv Sardi <xaiki@evilgiggle.com>
Merge pull request #4 from xaiki/master

customize how unread containing maildirs are shown
Allow custom propertize func
Allow custom action text and key
Update README
Fix parent maildir issue
"Make variables customizable" as pointed in issue #6 (https://github.com/agpchil/mu4e-maildirs-extension/issues/6).
Merge pull request #7 from ayman/master

defgroup customization
Fix default action text
Fix some docstrings
Add parent maildirs info and clean up code.

This adds parent maildirs info. Parent maildirs can be propertized now.
Propertize function has been changed to only recive 1 param (a plist) that
contains all the maildir information. Some variables have been clean up and
some functions renamed.
Merge remote-tracking branch 'main/master'
Remove unused variable
Update docs
[Issue #10] Add custom function for action str
Fix compilation warnings
Merge remote-tracking branch 'main/master'
manual update