Addressed most of my comments on PR 291 #17
Merged
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Initialize mrcStepNames to [].
Removed "if (state && state.stepNames) {" from loadExtraState.
Add braces to if statements.
Changed python code that checks whether initialize_steps has been set.
Added createStepsBlocks function to create the steps block for the toolbox.
Added constants for INPUT_CONDITION_PREFIX and INPUT_STEP_PREFIX.
Moved code to add shadow True blocks from updateShape to compose.