Add option to select more than one "Alternate color source"

[juarezr]

Some pages have no theme information and no favicon. In this case for coloring the only option is 'Page header background' or is 'Page header accent color'.
But when I select this, I can't use favicons in other pages.
Would be interesting having options for setting the priority like:

Page Background Color:
    [ x ] Page Theme               [ up ] [ down ]
    [ x ] Favicon                  [ up ] [ down ]
    [ x ] Page Header Background   [ up ] [ down ]
    [   ] Page Header Accent Color [ up ] [ down ]
    [ x ] Page Body Background     [ up ] [ down ]
    [ x ] Page Body Text           [ up ] [ down ]
    [ x ] Custom                   [ up ] [ down ] [ Choose... ]

Page Text Color:
    [ X ] Page Theme               [ up ] [ down ]
    [   ] Favicon                  [ up ] [ down ]
    [   ] Page Header Background   [ up ] [ down ]
    [ X ] Page Header Accent Color [ up ] [ down ]
    [   ] Page Body Background     [ up ] [ down ]
    [ x ] Page Body Text           [ up ] [ down ]
    [ x ] Custom                   [ up ] [ down ] [ Choose... ]

Alternative Page Background Color:
    [ x ] Page Theme               [ up ] [ down ]
    [ x ] Favicon                  [ up ] [ down ]
    [ x ] Page Header Background   [ up ] [ down ]
    [   ] Page Header Accent Color [ up ] [ down ]
    [ x ] Page Body Background     [ up ] [ down ]
    [ x ] Page Body Text           [ up ] [ down ]
    [ x ] Custom                   [ up ] [ down ] [ Choose... ]
   
Alternative Page Text Color:
    [ X ] Page Theme               [ up ] [ down ]
    [   ] Favicon                  [ up ] [ down ]
    [   ] Page Header Background   [ up ] [ down ]
    [ X ] Page Header Accent Color [ up ] [ down ]
    [   ] Page Body Background     [ up ] [ down ]
    [ x ] Page Body Text           [ up ] [ down ]
    [ x ] Custom                   [ up ] [ down ] [ Choose... ]

And for each option:

Selected Tab Background Color:  [ Page Background Color           v ] [ XXXX ] 
Selected Tab Text Color:        [                                 v ] [ XXXX ] [ Choose... ]
                                | Browser Background Color          |
                                | Browser Text Color                |
                                | Page Background Color             |
                                | Page Text Color                   |
                                | Alternative Page Background Color |
                                | Alternative Page Text Color       |
                                | Custom...                         |
                                -------------------------------------
...