Added Fast PS

When enabled:
When tuning to a new station PS is shown immediately. After two complete PS cycles normal PS detection is activated. This can cause incompete or faulty PS direct after tuning, which will recover.

Disabled:
After two complete PS cycles the PS is shown. This can take some longer time to show PS but will prevent errors as much as possible.

In previous builds fast PS was already enabled, but can now be disabled if wanted.

Also a small fix: when RDS is lost and level drops below low level threshold, the textcolor was not changed.

src/TEF6686.h

@@ -171,6 +171,7 @@ typedef struct _rds_ {
   bool rdsreset;
   bool pierrors;
   bool sortaf;
+  bool fastps;
   bool rtbuffer = true;
 } rds_;
 
@@ -274,7 +275,7 @@ class TEF6686 {
     bool useRTPlus = true;
     bool ABold;
     bool afreset;
-	bool mpxmode;
+    bool mpxmode;
     char stationTextBuffer[65];
     uint16_t piold;
     bool rtABold;
@@ -296,10 +297,10 @@ class TEF6686 {
     bool rdsCerrorThreshold;
     bool rdsDerrorThreshold;
     byte afmethodcounter;
-	bool packet0;
-	bool packet1;
-	bool packet2;
-	bool packet3;
+    bool packet0;
+    bool packet1;
+    bool packet2;
+    bool packet3;
 };
 
 #endif