Bugfixes in FX data allocation (#4783)

- Bugfixes in FX data allocation: realloc was not handled properly.
- Added *intermediate* fix for waitForIt(), see https://github.com/wled/WLED/issues/4779
- Bugfix in 1D->2D expansions: corner-expansion MUST be boundary checked as it blindly writes the max dimension
- removed some realloc(), improving fragmentation on large setups
- increased min heap constant
- ESP32 C3 has no PSRAM, it now uses default alloc functions
- also added missing UI info for "Error 7"

wled00/data/index.js

@@ -1527,6 +1527,9 @@ function readState(s,command=false)
 			case  3:
 				errstr = "Buffer locked!";
 				break;
+			case  7:
+				errstr = "No RAM for buffer!";
+				break;
 			case  8:
 				errstr = "Effect RAM depleted!";
 				break;