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.cpp

@@ -71,28 +71,24 @@ bool EInkDisplay::forceDisplay(uint32_t msecLimit)
         }
     }
 
+    // Trigger the refresh in GxEPD2
     LOG_DEBUG("Updating E-Paper... ");
-
-#if false
-    // Currently unused; rescued from commented-out line during a refactor
-    // Use a meaningful macro here if variant doesn't want fast refresh
-
-    // Full update mode (slow)
-    adafruitDisplay->display(false)
-#else
-    // Fast update mode
     adafruitDisplay->nextPage();
-#endif
 
-#ifndef EINK_NO_HIBERNATE // Only hibernate if controller IC will preserve image memory
-    // Put screen to sleep to save power (possibly not necessary because we already did poweroff inside of display)
-    adafruitDisplay->hibernate();
-#endif
+    // End the update process
+    endUpdate();
 
     LOG_DEBUG("done\n");
     return true;
 }
 
+// End the update process - virtual method, overriden in derived class
+void EInkDisplay::endUpdate()
+{
+    // Power off display hardware, then deep-sleep (Except Wireless Paper V1.1, no deep-sleep)
+    adafruitDisplay->hibernate();
+}
+
 // Write the buffer to the display memory
 void EInkDisplay::display(void)
 {
@@ -188,6 +184,7 @@ bool EInkDisplay::connect()
         // Init GxEPD2
         adafruitDisplay->init();
         adafruitDisplay->setRotation(3);
+        adafruitDisplay->clearScreen(); // Clearing now, so the boot logo will draw nice and smoothe (fast refresh)
     }
 #elif defined(PCA10059)
     {