Optimize Display: show current mode, git-tag...

Currently testing with breakoutboard and larger
1.3'' display (OFFSETX needed)
- display.cpp:
    - change structure (outsource in page functions)
    - add git and compile info to startup screen
    - add armchair mode and motor current to status screen
- control.hpp: Add methods to get current armchair control mode (string)
- motorctl.hpp: Add method to get motor current

common/motorctl.hpp

@@ -36,6 +36,8 @@ class controlledMotor {
         void setFade(fadeType_t fadeType, bool enabled); //enable/disable acceleration or deceleration fading
         void setFade(fadeType_t fadeType, uint32_t msFadeNew); //set acceleration or deceleration fade time
         bool toggleFade(fadeType_t fadeType); //toggle acceleration or deceleration on/off
+
+        float getCurrentA() {return cSensor.read();}; //read current-sensor of this motor (Ampere)
 											  
 		//TODO set current limit method