Improve bounds checking update CS management

Add bounds checking to graphics functions
Rationalise variable types and style used to minimse type casting needs
(this change ended up being a more extensive refactoring than
anticipated - but once started...)
Add version reporting to diagnostic sketch
Boost PDQ graphicstest performance

examples/160 x 128/TFT_graphicstest_PDQ3/TFT_graphicstest_PDQ3.ino

@@ -324,7 +324,7 @@ uint32_t testHaD()
     uint16_t curcolor = 0;
 
     const uint8_t *cmp = &HaD_128x160[0];
-
+    tft.startWrite();
     while (cmp < &HaD_128x160[sizeof(HaD_128x160)])
     {
       cnt = pgm_read_byte(cmp++);
@@ -335,6 +335,7 @@ uint32_t testHaD()
 
       curcolor ^= color;
     }
+    tft.endWrite();
   }
 
   tft.endWrite();
@@ -409,7 +410,7 @@ uint32_t testPixels()
   int32_t h = tft.height();
 
   uint32_t start = micros_start();
-
+  tft.startWrite();
   for (uint16_t y = 0; y < h; y++)
   {
     for (uint16_t x = 0; x < w; x++)
@@ -417,7 +418,7 @@ uint32_t testPixels()
       tft.drawPixel(x, y, tft.color565(x<<3, y<<3, x*y));
     }
   }
-  
+  tft.endWrite();
   return micros() - start;
 }
 

examples/320 x 240/TFT_graphicstest_PDQ/TFT_graphicstest_PDQ.ino

@@ -434,7 +434,7 @@ uint32_t testPixels()
 	int32_t	h = tft.height();
 
 	uint32_t start = micros_start();
-
+	tft.startWrite();
 	for (uint16_t y = 0; y < h; y++)
 	{
 		for (uint16_t x = 0; x < w; x++)
@@ -442,7 +442,7 @@ uint32_t testPixels()
 			tft.drawPixel(x, y, tft.color565(x<<3, y<<3, x*y));
 		}
 	}
-	
+	tft.endWrite();
 	return micros() - start;
 }
 

examples/Test and diagnostics/Read_User_Setup/Read_User_Setup.ino

@@ -41,6 +41,8 @@ void loop(void) {
 tft.getSetup(user); //
 
 Serial.printf("\n[code]\n");
+
+Serial.printf("TFT_eSPI ver = " + user.version) +"\n");
 Serial.printf("Processor    = ESP%i\n", user.esp, HEX);
 Serial.printf("Frequency    = %i MHz\n", ESP.getCpuFreqMHz());
 #ifdef ESP8266