Drizzlepac/HAP: Estimate work involved with separating Drizzlepac and HAP

[stscijgbot-hstdp]

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Issue HLA-1470 was created on JIRA by Steve Goldman:

Locally test the viability of a isolated drizzlepac codebase by removing the HAP code. A subsequent ticket will look at whether HAP can work on top a a base drizzlepac package.