Kobo: Refactor various aspects of the Kaleido/MTK support (#12221)

* UIManager: Let the fb backend deal with Kaleido wfm promotion. This fixes a number of quirks that poisoned the refresh queue with spurious full-screen refreshes. See https://github.com/koreader/koreader-base/pull/1865 for more details.
* This also means we now disable Kaleido waveform modes when color rendering is disabled (remember to trash your thumbnail cache if you don't want to mix color w/ grayscale thumbnails, though).
* UIManager: Merge refreshes that share an edge, because that was driving me nuts (and would have most likely been merged by the kernel anyway). A perfect test-case is the FM, which trips two separate refreshes because of its title bar.
* ReaderFlipping: Use sensible dimensions, so that we only refresh the icon's region.
* ReaderBookmark: Only refresh the dogear instead of the whole page when toggling bookmarks.
* NetworkSetting: Make it a real boy, so it consistently refreshes properly on dismiss instead of relying on UIManager saving the day.
* Kobo: Aggressively prevent *both* suspend & standby while MTK devices are plugged-in, as both will horribly implode the kernel (we previously only prevent standby while charging).
* Kobo: Switch to 8bpp on B&W MTK devices (or when color rendering is disabled on Kaleido panels).

frontend/apps/reader/modules/readerflipping.lua

@@ -43,15 +43,16 @@ function ReaderFlipping:init()
         dimen = Geom:new{w = Screen:getWidth(), h = self.flipping_widget:getSize().h},
         self.flipping_widget,
     }
-    self:resetLayout()
 end
 
 function ReaderFlipping:resetLayout()
-    local new_screen_width = Screen:getWidth()
-    if new_screen_width == self._last_screen_width then return end
-    self._last_screen_width = new_screen_width
+    -- NOTE: LeftContainer aligns to the left of its *own* width (and will handle RTL mirroring, so we can't cheat)...
+    self[1].dimen.w = Screen:getWidth()
+end
 
-    self[1].dimen.w = new_screen_width
+function ReaderFlipping:getRefreshRegion()
+    -- We can't use self.dimen because of the width/height quirks of Left/RightContainer, so use the IconWidget's...
+    return self[1][1].dimen
 end
 
 function ReaderFlipping:getRollingRenderingStateIconWidget()