Replace Evince with Papers

[ryonakano]

Fixes elementary/evince#98
Closes elementary/evince#99

Based on https://github.com/flathub/org.gnome.Papers

TODO

• Missing show/hide sidebar icon (will be fixed with new granite release I think)
• no padding in the sidebar
• Zoom controls are pretty much invisible
• Need to add a patch to rename style.css to Application.css so Granite will load it. Fixes a bunch of missing styles: https://gitlab.gnome.org/GNOME/papers/-/blob/main/shell/resources/papers.gresource.xml.in#L8

[ryonakano]

@danirabbit Would you take a look at the sidebar padding and invisible zoom controls you originally mentioned in elementary/evince#99 (comment)? I guess these issues related to CSS which is you're familiar with than me.

[danirabbit]

CSS should be all fixed up now! We just need new granite for that sidebar icon and I guess new runtime if we're relying on latest

[teamcons]

CSS should be all fixed up now! We just need new granite for that sidebar icon and I guess new runtime if we're relying on latest

Yup, looks much better now

But a couple kinks remain:
-Right click has empty highlighter pills
-Inside the window the mouse is weirdly bigger
-searchfield with placeholder on left pane clips up. Visible with highlight
-Adding a comment, the "comment orange square" has a mismatch between close and label
-dialog for "do you want to save changes" needs a bit of padding [EDIT: All "mini" dialogs do. "Sign digitally" has the issue, but not the Properties one]

first one impact functionality, the rest is more "oh strange but ok"

[danirabbit]

@teamcons ah thanks for the thorough testing! I'll fix those up too