PR #517: Throw exception on Store+Descriptor entries

* fix(zip): indicate that store/desc. entries cant be extracted
* style(zip): simplify and fix spelling
* fix(zip): check decompress support after specific exception handling
* test: use random bad path instead of possible network drive
* docs(zip): remove explicit mentions of methods in CompressionMethod
* fix(zip): remove superfluous null check

Author: piksel