[2.0.x] add VIKI2 test to Travis & fix LCD contrast (again)

* Update persistent_store_impl.cpp
* Remove define BYTE from serial functions since Arduino docs typically show 0 for the normal case.

WORKS!

[2.0.x] More TMC followup

[2.0.x] Creality CR-10S configurations

Provided by printedsolid.com

[2.0.x] Add multi-host support

[2.0.x] LPC1768 formatted print statements

[2.0.x]TMC followup

11 line caches PIO packages (toolchains, libs) which is very good! This PR will force PIO to find updates for installed libs and packages.

Fix duplicate language define warning

Table is very very similar to old 104-GT2 so I added only the name and recycled old ID

[2.0.x] MBL cleanup, has_mesh() method

Clarify the HAL_adc_get_result method to make sure correct values enter the filters

HAL: Fix the PID control loop for non-AVR platforms

[2.0.x] Set has_mesh if user issues G9 S3 with MBL

Prevents user from having to manually run through entire manual leveling process only to enable mesh so they can manually restore their offline mesh backup

Followup to 19e75ccf86

[2.0.x] fix Teensy2 compile error (PlatformIO LDF problem)

[2.0.x] Clockwise bmp fix

Clockwise arrow fixed

root cause identified

[2.0.x] SD card detect improvement

[2.0.x] New EEPROM powers