ESP32 Hardware SPI Improvements - Options for using both SPI peripherals, and DMA (#441)

* Fix header file comment

* Add TwoWireHspiImpl and Example

* Add start of TwoWireEsp32DmaSpiImple (Currently just able to use HSPI and VSPI in parallel, no DMA)

* Update names for TwoWireEsp32DmaSpi and set set spi_bus using template not constructor

* Update example with new functionality and bugfixes

* DotStarEsp32DmaSpiMethod -

* Add 5MHz option to all SPI-based classes

* DotStarGenericMethod - Give option to use Vspi alias of Spi class if wanting to specify which SPI peripheral is used on the ESP32
- Add missing DotStarHspiHzMethod

* TwoWireHspiImple - bring up to date with applySettings() method

* DotStarTest_Esp32Advanced example - update to show how to change clock speed at runtime
- Remove commented out pins cluttering up example

* DotStarTest_Esp32DmaSpi example -

Co-authored-by: Louis Beaudoin <louis@embedded-creations.com>

src/NeoPixelBus.h

@@ -104,6 +104,7 @@ License along with NeoPixel.  If not, see
 #include "internal/NeoEsp32I2sMethod.h"
 #include "internal/NeoEsp32RmtMethod.h"
 #include "internal/NeoEspBitBangMethod.h"
+#include "internal/DotStarEsp32DmaSpiMethod.h"
 
 #elif defined(ARDUINO_ARCH_NRF52840) // must be before __arm__
 
@@ -172,13 +173,20 @@ public:
         ClearTo(0);
     }
 
-    // used by DotStartSpiMethod if pins can be configured
+    // used by DotStarSpiMethod/DotStarEsp32DmaSpiMethod if pins can be configured
     void Begin(int8_t sck, int8_t miso, int8_t mosi, int8_t ss)
     {
         _method.Initialize(sck, miso, mosi, ss);
         ClearTo(0);
     }
 
+    // used by DotStarEsp32DmaSpiMethod if pins can be configured - reordered and extended version supporting quad SPI
+    void Begin(int8_t sck, int8_t dat0, int8_t dat1, int8_t dat2, int8_t dat3, int8_t ss)
+    {
+        _method.Initialize(sck, dat0, dat1, dat2, dat3, ss);
+        ClearTo(0);
+    }
+
     void Show(bool maintainBufferConsistency = true)
     {
         if (!IsDirty())