Async full-refresh for EInkDynamicDisplay (#3339)

* Move Wireless Paper V1.1 custom hibernate behavior to GxEPD2

* Async full-refresh for EInkDynamicDisplay

* initial config for T-Echo

* formatting
responds to https://github.com/meshtastic/firmware/pull/3339#discussion_r1518175434

* increase fast-refresh limit for T-Echo
https://github.com/meshtastic/firmware/pull/3339#issuecomment-1986245727

* change dependency from private repo to meshtastic/GxEPD2

---------

Co-authored-by: Ben Meadors <benmmeadors@gmail.com>

src/graphics/EInkDisplay2.h

@@ -45,6 +45,13 @@ class EInkDisplay : public OLEDDisplay
      */
     virtual bool forceDisplay(uint32_t msecLimit = 1000);
 
+    /**
+     * Run any code needed to complete an update, after the physical refresh has completed.
+     * Split from forceDisplay(), to enable async refresh in derived EInkDynamicDisplay class.
+     *
+     */
+    virtual void endUpdate();
+
     /**
      * shim to make the abstraction happy
      *