Use a single tab field separator in keywords.txt

Each field of keywords.txt is separated by a single true tab.
When you use multiple tabs it causes the field to be interpreted
as empty.
On Arduino IDE 1.6.5 and newer an empty KEYWORD_TOKENTYPE causes
the default editor.function.style highlighting to be used
(as with KEYWORD2, KEYWORD3).
On Arduino IDE 1.6.4 and older it causes the keyword to not be
recognized for any special highlighting.

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

Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>

Author: fpistm

libraries/Mouse/keywords.txt

@@ -17,7 +17,7 @@ click	KEYWORD2
 move	KEYWORD2
 press	KEYWORD2
 release	KEYWORD2
-isPressed KEYWORD2
+isPressed	KEYWORD2
 
 #######################################
 # Constants (LITERAL1)

libraries/SPI/keywords.txt

@@ -11,24 +11,24 @@ SPI	KEYWORD1
 #######################################
 # Methods and Functions (KEYWORD2)
 #######################################
-begin			KEYWORD2
-end				KEYWORD2
-transfer		KEYWORD2
+begin	KEYWORD2
+end	KEYWORD2
+transfer	KEYWORD2
 #setBitOrder	KEYWORD2
-setDataMode		KEYWORD2
+setDataMode	KEYWORD2
 setClockDivider	KEYWORD2
-setMISO			KEYWORD2
-setMOSI			KEYWORD2
-setSCLK			KEYWORD2
-setSSEL			KEYWORD2
+setMISO	KEYWORD2
+setMOSI	KEYWORD2
+setSCLK	KEYWORD2
+setSSEL	KEYWORD2
 
 #######################################
 # Constants (LITERAL1)
 #######################################
-SPI_MODE0		LITERAL1
-SPI_MODE1		LITERAL1
-SPI_MODE2		LITERAL1
-SPI_MODE3		LITERAL1
+SPI_MODE0	LITERAL1
+SPI_MODE1	LITERAL1
+SPI_MODE2	LITERAL1
+SPI_MODE3	LITERAL1
 
 SPI_CONTINUE	LITERAL1
-SPI_LAST		LITERAL1
+SPI_LAST	LITERAL1

libraries/Wire/keywords.txt

@@ -10,15 +10,15 @@
 # Methods and Functions (KEYWORD2)
 #######################################
 
-begin			KEYWORD2
-setClock		KEYWORD2
+begin	KEYWORD2
+setClock	KEYWORD2
 beginTransmission	KEYWORD2
-endTransmission		KEYWORD2
-requestFrom		KEYWORD2
-onReceive		KEYWORD2
-onRequest		KEYWORD2
-setSCL			KEYWORD2
-setSDA			KEYWORD2
+endTransmission	KEYWORD2
+requestFrom	KEYWORD2
+onReceive	KEYWORD2
+onRequest	KEYWORD2
+setSCL	KEYWORD2
+setSDA	KEYWORD2
 
 #######################################
 # Instances (KEYWORD2)