Fixes the following warnings when compiling using GCC 5.4:

    CXX OLEDDisplayUi.o
    ./OLEDDisplayUi.cpp: In member function 'void OLEDDisplayUi::drawFrame()':
    ./OLEDDisplayUi.cpp:284:48: error: 'y1' may be used uninitialized in this function [-Werror=maybe-uninitialized]
	    x *= dir; y *= dir; x1 *= dir; y1 *= dir;
						    ^
    ./OLEDDisplayUi.cpp:284:37: error: 'x1' may be used uninitialized in this function [-Werror=maybe-uninitialized]
	    x *= dir; y *= dir; x1 *= dir; y1 *= dir;
					 ^
    ./OLEDDisplayUi.cpp:284:26: error: 'y' may be used uninitialized in this function [-Werror=maybe-uninitialized]
	    x *= dir; y *= dir; x1 *= dir; y1 *= dir;
			      ^
    ./OLEDDisplayUi.cpp:284:16: error: 'x' may be used uninitialized in this function [-Werror=maybe-uninitialized]
	    x *= dir; y *= dir; x1 *= dir; y1 *= dir;
		    ^
    ./OLEDDisplayUi.cpp: In member function 'void OLEDDisplayUi::drawIndicator()':
    ./OLEDDisplayUi.cpp:393:35: error: 'y' may be used uninitialized in this function [-Werror=maybe-uninitialized]
	   this->display->drawFastImage(x, y, 8, 8, image);
				       ^
    ./OLEDDisplayUi.cpp:393:35: error: 'x' may be used uninitialized in this function [-Werror=maybe-uninitialized]
    ./OLEDDisplayUi.cpp:387:7: error: 'posOfHighlightFrame' may be used uninitialized in this function [-Werror=maybe-uninitialized]
	   if (posOfHighlightFrame == i) {
	   ^
    cc1plus: some warnings being treated as errors

Fix the following warnings, seen when compiling with GCC 5.4:

    CXX OLEDDisplay.o
    ./OLEDDisplay.cpp: In member function 'void OLEDDisplay::drawStringInternal(int16_t, int16_t, char*, uint16_t, uint16_t)':
    ./OLEDDisplay.cpp:381:10: error: enumeration value 'TEXT_ALIGN_LEFT' not handled in switch [-Werror=switch]
       switch (textAlignment) {
	      ^
    ./OLEDDisplay.cpp: In member function 'void OLEDDisplay::drawInternal(int16_t, int16_t, int16_t, int16_t, const char*, uint16_t, uint16_t)':
    ./OLEDDisplay.cpp:722:13: warning: unused variable 'yScreenPos' [-Wunused-variable]
	 int16_t yScreenPos = yMove + yOffset;
		 ^
    ./OLEDDisplay.cpp: In member function 'void OLEDDisplay::drawXbm(int16_t, int16_t, int16_t, int16_t, const char*)':
    ./OLEDDisplay.cpp:361:19: error: 'data' may be used uninitialized in this function [-Werror=maybe-uninitialized]
	     data >>= 1; // Move a bit
		       ^
    cc1plus: some warnings being treated as errors

Fix platforms in library.json

fix typo in integer type (causes compile error)

Closer to middle vertical align

Make OLEDDisplay.display() an abstract function

Implement setLoadingDrawFunction. Fixes #102

Without the `= 0` declaration, compiling with RTTI enabled fails.
See http://stackoverflow.com/a/307427/1880101 for an explanation.

Due to the 4px spacing, the indicators are a bit offset when adding them to LEFT or RIGHT sides of screen

Improve display performance of SH* drivers

Add SH1106Spi support

Fix internal black drawing

Add sample code

Make it possible to enable/disable all indicators

Fix a bug where multiline strings where not correctly centered

Improving rect drawing