Cosmetic code style refactoring: add enum for screen orientation & define for OLED state (#1732)

* saveSettings: add comment for #endif, update var name to reflect its purpose regardless its one-time & temporal

* Settings.h: add enum for orientation mode

* settingsGUI.cpp: add markings for #endifs, add/remove extra new lines to propose better code read-ability in my humble vision from the side, didnt touch any functionality only cosmetic syntax

* settingsGUI.cpp: remove added-by-accident new line in the end of the file

* OLED.hpp: unify ifdef section, add markings for #endifs, add readable macros for ON/OFF OLED state instead of magic numbers

* OLED.cpp: add markings for #endifs, add readable macros for ON/OFF OLED state instead of magic numbers, trying unify common style for the whole file for better read-ability

* Settings.cpp: unify code style

* settingsGUI.cpp: revert true/false for setDisplayRotation

* OLED.cpp: unify comments style

source/Core/Inc/Settings.h

@@ -86,6 +86,12 @@ typedef enum {
   ZERO   = 3, // Power on only (No heat Mode)
 } autoStartMode_t;
 
+typedef enum {
+  RIGHT = 0, // Right-hand screen orientation
+  LEFT  = 1, // Left-hand screen orientation
+  AUTO  = 2, // Automatic screen orientation based on accel.data if presented
+} orientationMode_t;
+
 // Settings wide operations
 void saveSettings();
 bool loadSettings();