[2.0.x] Support for SilverGate Board

Addressing #8166

Update InterruptVectors_Due.cpp

[2.0.x] Add SDCARD_SORT_ALPHA options for LPC1768

const pfnISR_Handler *isrtab = get_relocated_table_addr();

What compiler do you use? Arduino 1.8.5 can't compile this "const".

[2.0.x] Only show custom bootscreen once

* [2.0.x] Fix NO_MOTION_BEFORE_HOMING unwanted behaviour

NO_MOTION_BEFORE_HOMING should prevent XYZ movements only when homing is not done.
E axes should be allowed

* Update G0_G1.cpp

* Update G0_G1.cpp

* Basic support for Azteeg_X5_GT

Signed-off-by: Alexey Shvetsov <alexxy@gentoo.org>

* Add fan pins for AZTEEG X5 GT

Signed-off-by: Alexey Shvetsov <alexxy@gentoo.org>

* Fix endstop pins

* Add servo0 pin

[2.0.x] Apply Re-ARM SPI review items

[2.0.x] Kinematic clamp_to_software_endstops

Followup to #8122

2.0.x - Restore fix for garbaged display on Re-ARM with RepRap Full Graphics Smart Controller

add sort alpha section to other LPC1768 boards

[2.0.x] Fix AZSMZ Mini pins for new LPC1768 pinmapping

Addressing #8158

[2.0.x] Cleanup after SD Print Again, whitespace, tabs

[2.0.x] Define a default SERVO0_PIN for Anet 1.0

[2.0.x] Dual endstops XYZ

[2.0.x] Fix M303 thermal protection

* (2.0.x) serious bug G33

* Revert config changes

This reverts commit 74b5a98223.

* LPC1768 M43 cleanup

* Update pinmapping.h to #define pins

[2.0.x] Revert default BABYSTEP_MULTIPLICATOR to 1

[2.0.x] Arduino Due XON/XOFF implementation

Alos includes emergency parser and configurable TX/RX buffers for Arduino Due.

This is the ONLY way to be able to override ISRs stolen by the Arduino Runtime, such as Serial or USB device interrupts. This feature is needed so Arduino modules can be replaced and enhanced.

Instead of using const char, it is better to use uint8_t

Although this is an external contribution, clean up anyway to stop seeing it in global searches for typical flaws.