cannot build or debug on windows

[Steve-Mcl]

Current Behavior

some npm scripts use command concatenation and setting env vars. This is not compatible with windows devs

Expected Behavior

npm scripts should work

Steps To Reproduce

run any script with more than one command e.g. build:dev

Environment

• Dashboard version:
• Node-RED version:
• Node.js version:
• npm version:
• Platform/OS:
• Browser:

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I have provided an initial effort estimate