Update block colors#8

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shellydeng wants to merge 7 commits intomasterfrom

update-block-colors

Commits on Aug 29, 2017

Redo colour/style changes (#1)
mark-friedman
authored

Commits on Mar 20, 2018

move trash can above intercom icon (#2)
pmwthunkable
authored

Commits on Apr 10, 2018

Change block colors (#3)

yuexi2009
authored and
pmwthunkable
committed

Commits on May 8, 2018

change color on if and math_on_list block (#4)
pmwthunkable
authored

Commits on May 17, 2018

allow text blocks to handle undefined as empty strings (#5)
pmwthunkable
authored

Commits on Apr 19, 2019