[2.0.x] Reduce default jerk. XY by half. Z by 1/4

[2.0.x] remove SET_OUTPUT glitch - LPC1768 & DUE

[2.0.x] SCARA Feedrate Scaling for G2/G3 - using HYPOT

[2.0.x] RADDS LCD Display

adds setup for the original Radds Display+Controller+SD Card Reader PCB
http://doku.radds.org/dokumentation/lcd-display/

USB Mass Storage Implementation / CDC with HW flow control and misc fixes and improvements for Arduino DUE/RE-ARM based boards

[2.0.x][PlatformIO] Stop compiling after first five errors

[2.0.x][Language] Update Czech for Dec 2017

[2.0.x] Revert "Followup to #8698"

This reverts commit 4e891e9fb7.

[2.0.x] Restore position_float to LIN_ADVANCE

Reverting commit 3cd7659

Some to correct missing files from previous PR to completely avoid
HardwareTimer Class (reduce overhead). Some changes to formatting.
Changes to DMA ADC to work correctly.
Change to F1 sanity check.

Based on #8738
Addressing #8731

[2.0.x] One setting to validate filament width

[2.0.x] Add option for NO_VOLUMETRICS

[2.0.x] Fix SDSUPPORT for MKS SBASE

[2.0.x] Revert "Initial step correction"

Fix supplied by @cjsoong in https://github.com/MarlinFirmware/Marlin/issues/8750#issuecomment-350779983

This reverts commit 5cf6a062e3.

Followup to #8814

Runs in parallel to TravisCI and runs *much* faster on same jobs.  Finishes all examples configs in <8 min on cache hit; <10 min on cache miss.  Cache miss is triggered on platformio.ini change. I'd suggest move to it entirely, but it is limited to just 1500 min of runtime per month and it isn't clear yet how much Marlin would need so suggest we implement in parallel like this, then observe.  If the example builds don't catch issues, and 1500 min turns out to be plenty, we can switch to implimenting standard arsenal of tests in CircleCI and ditch TravisCI to gain speed improvement (although I do like seeing the varied Travis avatars staring at me ;).

I agree that hand-crafted tests would be better, but until we have that, this can't hurt.

After merging, you'll need to add Marlin project to CircleCI at: https://circleci.com
Example results at: https://github.com/fiveangle/Marlin/commits/bf-circleci_config

* Adding support for using the MKS_12864OLED with the SSD1306 controller

* Update comment for correct controller type