cppcheck: fix unusedVariable
Merge pull request #76 from toxeus/unusedVariable

cppcheck: fix unusedVariable
cppcheck: don't use C-style casts
Merge pull request #77 from toxeus/removeCCast

cppcheck: don't use C-style casts
Fixed Windows not using header-only version of Chai
Merge pull request #78 from BugFreeSoftware/chai_fix

Fixed Windows not using header-only version of Chai
cmake: Build with keyring option