Proper Forma support (#4414)

* Enforce a known rotation on startup, to make sure we handle touch input coordinates properly.
* Proper FrontLight warmth support (thanks to @cairnsh & @pazos in #4291)!
* Fix the PageTurn buttons mapping to match Nickel's defaults
* Properly remap PageTurn buttons depending on the current rotation.
* Actually enable the Mk.7 screen refresh codepath on *all* Mk.7 devices (I'd messed up the device check...).
* Full accelerometer handling (includes a touch of refactoring regarding orientation handling in general).
* Fix insidiously broken USBMS behavior in Nickel after we exit on FW >4.8.

Fix #4291
Fix #3002

frontend/apps/reader/modules/readerrolling.lua

@@ -639,11 +639,12 @@ function ReaderRolling:onSetDimensions(dimen)
     self.ui.document:setViewDimen(Screen:getSize())
 end
 
-function ReaderRolling:onChangeScreenMode(mode)
+function ReaderRolling:onChangeScreenMode(mode, rotation)
     -- We need to temporarily re-enable internal history as crengine
     -- uses it to reposition after resize
     self.ui.document:enableInternalHistory(true)
-    self.ui:handleEvent(Event:new("SetScreenMode", mode))
+    -- Flag it as interactive so we can properly swap to Inverted orientations (we usurp the second argument, which usually means rotation)
+    self.ui:handleEvent(Event:new("SetScreenMode", mode, rotation or true))
     self.ui.document:setViewDimen(Screen:getSize())
     self:onChangeViewMode()
     self:onUpdatePos()