fixing a few implicit promotions to double

any expression with at least on "double" is evaluated as double, which is slow.

wled00/led.cpp

@@ -189,7 +189,7 @@ void handleTransitions()
   if (transitionActive && transitionDelayTemp > 0)
   {
     float tper = (millis() - transitionStartTime)/(float)transitionDelayTemp;
-    if (tper >= 1.0)
+    if (tper >= 1.0f)
     {
       strip.setTransitionMode(false);
       transitionActive = false;

wled00/lx_parser.cpp

@@ -25,7 +25,7 @@ bool parseLx(int lxValue, byte* rgbw)
     float tmpBri = floor((lxValue - 200000000) / 10000); ;
     uint16_t ct = (lxValue - 200000000) - (((uint8_t)tmpBri) * 10000);
 
-    tmpBri *= 2.55;
+    tmpBri *= 2.55f;
     tmpBri = constrain(tmpBri, 0, 255);
 
     colorKtoRGB(ct, rgbw);

wled00/util.cpp

@@ -520,7 +520,7 @@ um_data_t* simulateSound(uint8_t simulationId)
   maxVol        = 31;  // this gets feedback fro UI
   binNum        = 8;   // this gets feedback fro UI
   volumeRaw = volumeSmth;
-  my_magnitude = 10000.0 / 8.0f; //no idea if 10000 is a good value for FFT_Magnitude ???
+  my_magnitude = 10000.0f / 8.0f; //no idea if 10000 is a good value for FFT_Magnitude ???
   if (volumeSmth < 1 ) my_magnitude = 0.001f;             // noise gate closed - mute
 
   return um_data;

wled00/wled_math.cpp

@@ -41,7 +41,7 @@ float sin_t(float x) {
 
 float tan_t(float x) {
   float c = cos_t(x);
-  if (c==0.0) return 0;
+  if (c==0.0f) return 0;
   float res = sin_t(x) / c;
   #ifdef WLED_DEBUG_MATH
   Serial.printf("tan: %f,%f,%f,(%f)\n",x,res,tan(x),res-tan(x));
@@ -54,14 +54,14 @@ float tan_t(float x) {
 float acos_t(float x) {
   float negate = float(x < 0);
   float xabs = std::abs(x);
-  float ret = -0.0187293;
+  float ret = -0.0187293f;
   ret = ret * xabs;
-  ret = ret + 0.0742610;
+  ret = ret + 0.0742610f;
   ret = ret * xabs;
-  ret = ret - 0.2121144;
+  ret = ret - 0.2121144f;
   ret = ret * xabs;
   ret = ret + HALF_PI;
-  ret = ret * sqrt(1.0-xabs);
+  ret = ret * sqrt(1.0f-xabs);
   ret = ret - 2 * negate * ret;
   float res = negate * PI + ret;
   #ifdef WLED_DEBUG_MATH

wled00/xml.cpp

@@ -587,7 +587,7 @@ void getSettingsJS(byte subPage, char* dest)
     sappends('s',SET_F("LT"),tm);
     getTimeString(tm);
     sappends('m',SET_F("(\"times\")[0]"),tm);
-    if ((int)(longitude*10.) || (int)(latitude*10.)) {
+    if ((int)(longitude*10.0f) || (int)(latitude*10.0f)) {
       sprintf_P(tm, PSTR("Sunrise: %02d:%02d Sunset: %02d:%02d"), hour(sunrise), minute(sunrise), hour(sunset), minute(sunset));
       sappends('m',SET_F("(\"times\")[1]"),tm);
     }