s:ProcessSign does not handle new sign output

[blueyed]

Code ref:

quickfixsigns_vim/plugin/quickfixsigns.vim

Line 875 in 653cf16

let m = matchlist(a:sign, '^\s\+\S\+=\(\d\+\)\s\+\S\+=\(\d\+\)\s\+\S\+=\(\S\+\)\s*$')

Example sign-place output:

['--- Signs ---', 'Signs for foo:', '    line=99  id=3000  name=GitGutterLineModified  priority=10', '    line=100  id=3001  name=GitGutterLineAdded  priority=10' …

It should probably use the new sign_getplaced() there.