longer segment names

* introducing WLED_MAX_SEGNAME_LEN from upstream
* default: max name length = 48
* hopefully found all places where the segment name length was hardcoded (32, 33, 34)
* some comments still refer to "32" but wtf

wled00/const.h

@@ -91,6 +91,22 @@
   #endif
 #endif
 
+#ifndef WLED_MAX_SEGNAME_LEN
+  #ifdef ESP8266
+    #define WLED_MAX_SEGNAME_LEN 32
+  #else
+    #define WLED_MAX_SEGNAME_LEN 48  // WLEDMM upstream uses 64, but 48 seems to be a good compromise between flexibility and memory needed
+  #endif
+#else
+  #if WLED_MAX_SEGNAME_LEN<32
+    #undef WLED_MAX_SEGNAME_LEN
+    #define WLED_MAX_SEGNAME_LEN 32
+  #else
+    #warning WLED UI does not support your modified maximum segment name length!
+  #endif
+#endif
+
+
 //Usermod IDs
 #define USERMOD_ID_RESERVED               0     //Unused. Might indicate no usermod present
 #define USERMOD_ID_UNSPECIFIED            1     //Default value for a general user mod that does not specify a custom ID