Reduce raw string pointers usage

Pavel Solodovnikovrequested to merge
pa.solodovnikov/cmake:feature/string_interface into master
  • Change some functions to take std::string instead of const char* in the following classes: cmMakeFile, cmake, cmCoreTryCompile, cmSystemTools, cmState, cmLocalGenerator and a few others.
  • Greatly reduce using of const char* overloads for cmSystemTools::MakeDirectory and cmSystemTools::RelativePath.
  • Remove many redundant c_str() conversions throughout the code.

Topic-rename: std-string-apis

Edited by Brad King

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