Implement View Text (#406)

* View text and code cleanup

* Typo fix

* Fixed case generation

* check list fixed

* Horizontal clipping fixed

* Lost letter fixed.

* Cleanup

* Unified implementation (Rotory button support)

* Fixed USB menu issue and RTN button.

* Rotary encoder acceleration implemented

* Do not close file on every line read

* Sliding window implemented. File size limitations practically removed.

* scrollbar implemented

* Cleanup & scroll bar adjustment

* Cleanup

* Smoother scrolling for long lines.

* Minor cleanup

radio/src/opentx.cpp

@@ -26,6 +26,7 @@
   // #include "shutdown_animation.h"
   #include "radio_calibration.h"
   #include "view_main.h"
+  #include "view_text.h"
 #endif
 
 #if defined(PCBSKY9X)
@@ -745,13 +746,9 @@ void checkAll()
   disableVBatBridge();
 #endif
 
-#if defined(COLORLCD)
-#warning "Model notes missing"
-#else
   if (g_model.displayChecklist && modelHasNotes()) {
     readModelNotes();
   }
-#endif
 
 #if defined(MULTIMODULE)
   checkMultiLowPower();