Feature/nine additional alexa devices for presets (#2787)

* add 9 further alexa devices for calling presets 1-9

* use preset names from WLED for Alexa preset device names instead of hardcoded names

* update readme and version

* call alexaInit() at end of savePreset() to keep Alexa in sync with the preset IDs and names

* This reverts commit f8db06c7c5.

* change order to configured Alexa WLED name first, preset names afterwards

* fix status of devices when shown within Alexa, i.e. switching one preset on switches others off (except for alexaInvocationName)

* re-add getPresetName() after merge with master

* restore original readme for pull request

* restore original platformio.ini for pull request

* Logic simplification

* Pass string by reference

* Added number of presets check

* fix alexaInit() in case of alexaNumPresets==0

Co-authored-by: Christian Schwinne <dev.aircoookie@gmail.com>

wled00/wled.h

@@ -113,7 +113,7 @@
 #ifndef WLED_DISABLE_ALEXA
   #define ESPALEXA_ASYNC
   #define ESPALEXA_NO_SUBPAGE
-  #define ESPALEXA_MAXDEVICES 1
+  #define ESPALEXA_MAXDEVICES 10
   // #define ESPALEXA_DEBUG
   #include "src/dependencies/espalexa/Espalexa.h"
 #endif
@@ -358,6 +358,7 @@ WLED_GLOBAL uint8_t udpNumRetries _INIT(0);                       // Number of t
 
 WLED_GLOBAL bool alexaEnabled _INIT(false);                       // enable device discovery by Amazon Echo
 WLED_GLOBAL char alexaInvocationName[33] _INIT("Light");          // speech control name of device. Choose something voice-to-text can understand
+WLED_GLOBAL byte alexaNumPresets _INIT(0);                        // number of presets to expose to Alexa, starting from preset 1, up to 9
 
 #ifndef WLED_DISABLE_BLYNK
 WLED_GLOBAL char blynkApiKey[36] _INIT("");                       // Auth token for Blynk server. If empty, no connection will be made