Add toolbox location and toolbox mode options to playground.
Add toolbox location and toolbox mode options to playground.

gengshenghong/scratch-blocks,nickmain/blockly,jstnhuang/blockly,drigz/blockly,twodee/blockly,InspectorWidget/blockly,lzairdking/blockly,griffpatch/scratch-blocks,sclements/scratch-blocks,lzairdking/blockly,LLK/scratch-blocks,LLK/scratch-blocks,gengshenghong/scratch-blocks,jano42/blockly,gengshenghong/scratch-blocks,picklesrus/blockly,picklesrus/blockly,nickmain/blockly,trinketapp/blockly,nickmain/blockly,google/blockly,hkoi/blockly,rachel-fenichel/blockly,TechplexEngineer/blockly,trinketapp/blockly,markocelan/blockly-minecraft,RealTimeWeb/blockly,sclements/scratch-blocks,mark-friedman/blockly,carlosperate/blockly,carlosperate/blockly,gengshenghong/scratch-blocks,google/blockly,rachel-fenichel/blockly,twodee/blockly,drigz/blockly,rachel-fenichel/blockly,jstnhuang/blockly,joshlory/blockly,google/blockly,griffpatch/scratch-blocks,groklearning/blockly,nickmain/blockly,griffpatch/scratch-blocks,groklearning/blockly,twodee/blockly,mark-friedman/blockly,sclements/scratch-blocks,markocelan/blockly-minecraft,dhalupa/blockly,trodi/blockly,jano42/blockly,carlosperate/blockly,hkoi/blockly,twodee/blockly,groklearning/blockly,mark-friedman/blockly,jano42/blockly,daarond/blockly,nickmain/blockly,rachel-fenichel/blockly,google/blockly-devtools,google/blockly,dhalupa/blockly,trodi/blockly,google/blockly-devtools,mark-friedman/blockly,TechplexEngineer/blockly,trinketapp/blockly,joshlory/blockly,carlosperate/blockly,twodee/blockly,jano42/blockly,jstnhuang/blockly,LLK/scratch-blocks,picklesrus/blockly,google/blockly,daarond/blockly,mark-friedman/blockly,RealTimeWeb/blockly,aravart/speech-blocks,markocelan/blockly-minecraft,sclements/scratch-blocks,twodee/blockly,LLK/scratch-blocks,InspectorWidget/blockly,rachel-fenichel/blockly,mark-friedman/blockly,daarond/blockly,trodi/blockly,griffpatch/scratch-blocks,InspectorWidget/blockly,dhalupa/blockly,jstnhuang/blockly,nickmain/blockly,LLK/scratch-blocks,rachel-fenichel/blockly,lzairdking/blockly,google/blockly,trinketapp/blockly,markocelan/blockly-minecraft,joshlory/blockly,aravart/speech-blocks,google/blockly,hkoi/blockly,RealTimeWeb/blockly,sclements/scratch-blocks,lzairdking/blockly,trodi/blockly,griffpatch/scratch-blocks,drigz/blockly,gengshenghong/scratch-blocks,rachel-fenichel/blockly,groklearning/blockly