Proposal for using checkbox instead of True/False (#177)

Replace True/False icons with checkbox symbols :)

workspace/TS100/inc/OLED.hpp

@@ -41,6 +41,7 @@ public:
 	// Draws a number at the current cursor location
 	void clearScreen();						// Clears the buffer
 	void drawBattery(uint8_t state);		// Draws the battery level symbol
+	void drawCheckbox(bool state);		// Draws a checkbox
 	void drawSymbol(uint8_t symbolID);//Used for drawing symbols of a predictable width
 	void drawArea(int16_t x, int8_t y, uint8_t wide, uint8_t height,
 			const uint8_t* ptr);