[#70326328]: include varsInGlobals as a config param
[Finishes #71443508] stepping through while loop
comment update
Merge pull request #591 from code-dot-org/loopStep

[Finishes #71443508] stepping through while loop
undeletable blocks, disable neighbor bumping
Imported from blockly-core
Merge pull request #592 from code-dot-org/jigsawBugs

[Finishes #70791820, #71629086] undeletable blocks, disable neighbor bumping
Imported from blockly-core
merge
Merge pull request #588 from code-dot-org/studio_use_varsInGlobals

[#70326328]: include varsInGlobals as a config param
remove placeholder sprite images
migrate loc/string changes from blockly-core
[#70326328]: enable functions, remove placeholder sprite images
Merge pull request #594 from code-dot-org/studio_functions

Blockly: merge Blockly-Core strings, Studio: add functions & remove placeholder images
studio: adjust sprite images used in level progression
better user code execution tracking
move ticks and checkTimeout into executionInfo
get rid of executionInfo from apps that don't use it