Use correct field separator in keywords.txt

The Arduino IDE requires the use of a single true tab separator between the keyword name and identifier. When spaces are used rather than a true tab, the keyword is not highlighted.

Reference:
https://github.com/arduino/Arduino/wiki/Arduino-IDE-1.5:-Library-specification#keywords

Author: per1234

keywords.txt

@@ -12,83 +12,83 @@ Heltec	KEYWORD3
 # Datatypes (KEYWORD1)
 #######################################
 
-LoRa	  KEYWORD1
+LoRa	KEYWORD1
 display	KEYWORD1
 
 #######################################
 # Methods and Functions (KEYWORD2)
 #######################################
 
-begin	        KEYWORD2
-end           KEYWORD2
-write         KEYWORD2
-sleep         KEYWORD2
+begin	KEYWORD2
+end	KEYWORD2
+write	KEYWORD2
+sleep	KEYWORD2
 
-beginPacket	  KEYWORD2
-endPacket     KEYWORD2
-parsePacket   KEYWORD2
-packetRssi    KEYWORD2
-packetSnr     KEYWORD2     
-available     KEYWORD2
-peek          KEYWORD2
-flush         KEYWORD2
-onReceive     KEYWORD2
-receive       KEYWORD2
-read          KEYWORD2
-idle          KEYWORD2
-setTxPower    KEYWORD2
-setTxPowerMax KEYWORD2
-setFrequency  KEYWORD2
-setSpreadingFactor    KEYWORD2
-setSignalBandwidth    KEYWORD2
-setCodingRate4        KEYWORD2
-setPreambleLength     KEYWORD2
-setSyncWord   KEYWORD2
-enableCrc     KEYWORD2
-disableCrc    KEYWORD2
-crc           KEYWORD2
-noCrc         KEYWORD2
-random        KEYWORD2
-setpins       KEYWORD2
-setSPIFrequency       KEYWORD2
-dumpRegisters KEYWORD2
+beginPacket	KEYWORD2
+endPacket	KEYWORD2
+parsePacket	KEYWORD2
+packetRssi	KEYWORD2
+packetSnr	KEYWORD2
+available	KEYWORD2
+peek	KEYWORD2
+flush	KEYWORD2
+onReceive	KEYWORD2
+receive	KEYWORD2
+read	KEYWORD2
+idle	KEYWORD2
+setTxPower	KEYWORD2
+setTxPowerMax	KEYWORD2
+setFrequency	KEYWORD2
+setSpreadingFactor	KEYWORD2
+setSignalBandwidth	KEYWORD2
+setCodingRate4	KEYWORD2
+setPreambleLength	KEYWORD2
+setSyncWord	KEYWORD2
+enableCrc	KEYWORD2
+disableCrc	KEYWORD2
+crc	KEYWORD2
+noCrc	KEYWORD2
+random	KEYWORD2
+setpins	KEYWORD2
+setSPIFrequency	KEYWORD2
+dumpRegisters	KEYWORD2
 
-drawString    KEYWORD2
-display       KEYWORD2
-wakeup        KEYWORD2
-resetDisplay  KEYWORD2
-setColor      KEYWORD2
-getColor      KEYWORD2
-setPixel      KEYWORD2
-drawLine      KEYWORD2
-drawRect      KEYWORD2
-fillRect      KEYWORD2
-drawCircle    KEYWORD2
-drawCircleQuads     KEYWORD2
-fillCircle    KEYWORD2
-drawHorizontalLine  KEYWORD2
-drawVerticalLine    KEYWORD2
-drawProgressBar     KEYWORD2
-drawFastImage       KEYWORD2
-drawXbm             KEYWORD2
-drawStringMaxWidth  KEYWORD2
-getStringWidth      KEYWORD2
-getStringWidth      KEYWORD2
-setTextAlignment    KEYWORD2
-setFont             KEYWORD2
-setFontTableLookupFunction    KEYWORD2
-displayOn           KEYWORD2
-displayOff          KEYWORD2
-invertDisplay       KEYWORD2
-normalDisplay       KEYWORD2
-setContrast         KEYWORD2
-setBrightness       KEYWORD2
-resetOrientation    KEYWORD2
-flipScreenVertically          KEYWORD2
-mirrorScreen        KEYWORD2
-clear               KEYWORD2
-setLogBuffer        KEYWORD2
-drawLogBuffer       KEYWORD2
-getWidth            KEYWORD2
-getHeight           KEYWORD2
+drawString	KEYWORD2
+display	KEYWORD2
+wakeup	KEYWORD2
+resetDisplay	KEYWORD2
+setColor	KEYWORD2
+getColor	KEYWORD2
+setPixel	KEYWORD2
+drawLine	KEYWORD2
+drawRect	KEYWORD2
+fillRect	KEYWORD2
+drawCircle	KEYWORD2
+drawCircleQuads	KEYWORD2
+fillCircle	KEYWORD2
+drawHorizontalLine	KEYWORD2
+drawVerticalLine	KEYWORD2
+drawProgressBar	KEYWORD2
+drawFastImage	KEYWORD2
+drawXbm	KEYWORD2
+drawStringMaxWidth	KEYWORD2
+getStringWidth	KEYWORD2
+getStringWidth	KEYWORD2
+setTextAlignment	KEYWORD2
+setFont	KEYWORD2
+setFontTableLookupFunction	KEYWORD2
+displayOn	KEYWORD2
+displayOff	KEYWORD2
+invertDisplay	KEYWORD2
+normalDisplay	KEYWORD2
+setContrast	KEYWORD2
+setBrightness	KEYWORD2
+resetOrientation	KEYWORD2
+flipScreenVertically	KEYWORD2
+mirrorScreen	KEYWORD2
+clear	KEYWORD2
+setLogBuffer	KEYWORD2
+drawLogBuffer	KEYWORD2
+getWidth	KEYWORD2
+getHeight	KEYWORD2