Support for Geeetech GT2560 Rev.A/Rev.A+

Geeetech I3 Pro X + GT2560 Config

As proposed in #7429

Make audible user script feedback optional

* Fix compilation of ADVANCED_PAUSE_FEATURE without SDSUPPORT

* Fix Identation

* Make use of IS_SD_PRINTING macro

as per @MagoKimbra

Add VScode directory to .gitignore

Update language_de.h v2

Add a parameter to enable/disable audible user script feedback

PlatformIO can be used with VSCode.  VSCode creates a .vscode directory which should be ignored.

Add
MSG_BLTOUCH                    
MSG_DELTA_SETTINGS            
MSG_UBL_MESH_EDIT                
MSG_UBL_OUTPUT_MAP_BACKUP        
MSG_UBL_STEP_BY_STEP_MENU       
MSG_Z_FADE_HEIGHT

Followup cleanup patch

Fix regression in #7428

Update Russian Translation

Clean up whitespace, trailing space, bad tab conversion, etc.

move from legacy precise to trusty build image
fix PATH not including buildroot/bin
remove symolic link to ~/bin
enable sudo

trusty travis image doesn't source ~/bin by default
avr requires sude

TravisCI "trusty" build dist isn't picking up build path causing travis checks to fail.  Reverting to legacy "precise" dist while we investigate

pristine != precise

Clarify LCD_BED_LEVELING requirements

Fix for #7395

LCD_BED_LEVELING requires PROBE_MANUALLY with auto bed leveling enabled.  See #7396

Filament change causes freeze during paused print. This PR disables Filament change in the prepare menu when a print from SD Card is paused. See #7395

Fix DUAL_X_CARRIAGE movement

Axis would only move when homing.
Bug introduced in 91841d75c9.
Fixes #6956, fixes #7050 and fixes #7291

Manual Bed Leveling: Goto previous Z height at each probe point

Implement probing delay for piezo sensors

Fixes for FWRETRACT

Move Delta Calibration menu to the Prepare menu

Patch to fix some compiler warnings

Makefile fixes and U8G support.