Revert "common: Provide (...) toString for Cygwin"

Revert "common: Provide an implementetion of toString for Cygwin"
This reverts commit 9f9e9157f5475d4e9d251138a090b9a408e9b5fa.

Change-Id: I238f955389e2e05364ae1792536d972e3d095615
Revert "all: Replace all calls to std::string with a call (...)"

Revert "all: Replace all calls to std::string with a call to a wrapper"
This reverts commit 984f91945e403926d410ee2939a67b061a7815a9.

Change-Id: I626aecdca13439baa6e8e8f1a9ea213c2be12ca8