MD-Basic support.#5

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ksherlock wants to merge 3 commits intoblondie7575:masterfrom

ksherlock:mdbasic

Commits on Apr 3, 2018

MD-Basic support. Includes header file and MDBasic demo.
ksherlock
committed
fix the quit button (was calling a line number that doesn’t exist)
ksherlock
committed
update MDBasic header with new/changed ampersand commands.
ksherlock
committed