support parsing substring with ' ' space

[elahehrashedi]

Add support parsing define variables that are in the form of a string, e.g., and also variables that include a space in the string:

target_compile_definitions(testPRa PUBLIC AWESOME="'pr a'")
target_compile_definitions(testPRb PUBLIC AWESOME="'pr b'")
set(CMAKE_CXX_COMPILER "c:/program files (x86)/mingw-w64/i686-8.1.0-posix-dwarf-rt_v6-rev0/mingw32/bin/g++.exe")

bug:
main:
#969
#1414

duplicates:
#1493
#1565

[elahehrashedi]

The test from the wrong input file was running. I had to recreate the branch.