This minor version again transforms Message Descriptors in source files to remove theirdescription fields, but in an idempotent-way, effectively reverting the change in#28.

A newextractSourceLocation has been added which will also extract metadata about the location of the message in the source file. When enabled, thenfile,start, andend fields will exist for each extracted message descriptors; it defaults tofalse.

• Added test suite and CI integration#69 (@STRML)
• AddedextractSourceLocation option#73 (Fixes:#71)
• description fields are removed after extracting Message Descriptors#74