Add codecov.io coverage collection from AppVeyor

Also had to add new project to redirect CTest output, add
separate batch scripts for AppVeyor because it doesn't handle
multi-line batch scripts in yaml properly, and other helper
scripts.

CMakeLists.txt

@@ -325,7 +325,7 @@ if (NOT NO_SELFTEST)
 
 
     # configure unit tests via CTest
-    enable_testing()
+    include(CTest)
     add_test(NAME RunTests COMMAND $<TARGET_FILE:SelfTest>)
 
     add_test(NAME ListTests COMMAND $<TARGET_FILE:SelfTest> --list-tests --verbosity high)
@@ -341,6 +341,7 @@ if (NOT NO_SELFTEST)
     set_tests_properties(ListTestNamesOnly PROPERTIES PASS_REGULAR_EXPRESSION "Regex string matcher")
 
 
+
     # AppVeyor has a Python 2.7 in path, but doesn't have .py files as autorunnable
     add_test(NAME ApprovalTests COMMAND python ${CMAKE_CURRENT_SOURCE_DIR}/scripts/approvalTests.py $<TARGET_FILE:SelfTest>)
     set_tests_properties(ApprovalTests PROPERTIES FAIL_REGULAR_EXPRESSION "Results differed")
@@ -360,7 +361,6 @@ if(BUILD_EXAMPLES)
     add_subdirectory(examples)
 endif()
 
-
 install(DIRECTORY "single_include/" DESTINATION "include/catch")
 
 ## Provide some pkg-config integration