Improved QR-code setup, added MCAP screen

lib/qrcode/qrcodegen.c

@@ -1,3 +1,5 @@
+#ifdef USE_QR
+
 /* 
  * QR Code generator library (C)
  * 
@@ -1026,3 +1028,4 @@ static int numCharCountBits(enum qrcodegen_Mode mode, int version) {
 
 
 #undef LENGTH_OVERFLOW
+#endif

lib/qrcode/qrcodegen.h

@@ -20,6 +20,7 @@
  *   out of or in connection with the Software or the use or other dealings in the
  *   Software.
  */
+#ifdef USE_QR
 
 #pragma once
 
@@ -383,3 +384,6 @@ bool qrcodegen_getModule(const uint8_t qrcode[], int x, int y);
 #ifdef __cplusplus
 }
 #endif
+
+
+#endif