add limit for write to leddevice (#432)

* add limit for write to leddevice

* add to default config

* add i18n

* extend xmas effect

* fix indention

* add check for minimum brightness

* adapt effects to fading and new minWriteTime

* remove old latchTime
rename minimumWriteTime to latchTime
make it as dev specific option

* set default for rewriteTime to 1s
pause smoothing on color too

* reenable smoothing for color - it looks nicer :-)

* fix timeout timer

config/hyperion.config.json.commented

@@ -27,13 +27,15 @@
 	/// * [device type specific configuration]
 	/// * 'colorOrder' : The order of the color bytes ('rgb', 'rbg', 'bgr', etc.).
 	/// * 'rewriteTime': in ms. Data is resend to leds, if no new data is available in thistime. 0 means no refresh
+	/// * 'latchTime' : minimum time between led writes. 0 means no limit. default 10 means a rate of max 100Hz write time
 	"device" :
 	{
 		"type"       : "file",
 		"output"     : "/dev/null",
 		"rate"     : 1000000,
 		"colorOrder" : "rgb",
-		"rewriteTime": 0
+		"rewriteTime": 0,
+		"latchTime" : 10
 	},
 
 	/// Color manipulation configuration used to tune the output colors to specific surroundings. 

config/hyperion.config.json.default

@@ -16,7 +16,8 @@
 		"output"     : "/dev/null",
 		"rate"       : 1000000,
 		"colorOrder" : "rgb",
-		"rewriteTime": 5000
+		"rewriteTime": 5000,
+		"latchTime" : 10
 	},
 
 	"color" :