Issue #2929783 by tim.plunkett, MerryHamster, bnjmnm, xjm, webchick, samuel.mortenson, EclipseGc, kevincrafts, ndf, DyanneNova, yoroy, TheodorosPloumis, tedbow, pixelite, seanB, phenaproxima, AaronMcHale, benjifisher: Review Layout Builder UI terminology

Issue #2957425 by tedbow, johndevman, mpotter, tim.plunkett, hawkeye.twolf, alexpott, Berdir, samuel.mortenson, xjm, kevincrafts, jibran, amateescu, larowlan, twfahey, EclipseGc, sjerdo, japerry, mtodor, phenaproxima, johnzzon, mglaman: Allow the inline creation of non-reusable Custom Blocks in the layout builder

Revert "Issue #2957425 by tedbow, johndevman, tim.plunkett, hawkeye.twolf, Berdir, alexpott, samuel.mortenson, kevincrafts, jibran, larowlan, amateescu, twfahey, sjerdo, mtodor, japerry, xjm, phenaproxima, mglaman, EclipseGc, johnzzon: Allow the inline creation of non-reusable Custom Blocks in the layout builder"

This reverts commit 500403b4.

Issue #2957425 by tedbow, johndevman, tim.plunkett, hawkeye.twolf, Berdir, alexpott, samuel.mortenson, kevincrafts, jibran, larowlan, amateescu, twfahey, sjerdo, mtodor, japerry, xjm, phenaproxima, mglaman, EclipseGc, johnzzon: Allow the inline creation of non-reusable Custom Blocks in the layout builder