Switch report handler to a global hook (#29) * Switch report handler to a global hook * more cleanup * remove default from example * remove broken support for no_std * back out the unneeded nostd check * remove one stackframe when capturing a Handler * update docs and prep for release * port lib.rs docs updates to readme

Created by  Jane Lusby  on July 5, 2020
MDCKAPJFOWFR5HBN3CU6ZGKYXP3QND5H5IV53ZKT34HPTR3YAEDAC
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