diagnostic, fixer and test for making variables constants whenever it's possible
Merge branch 'MakeConst' of https://github.com/ElemarJR/code-cracker into ElemarJR-MakeConst

Conflicts:
	src/CodeCracker/CodeCracker.csproj
	test/CodeCracker.Test/CodeCracker.Test.csproj
position trivia correctly when making constants

remove trailing spaces, extra lines, etc
closes #79
Merge branch 'ElemarJR-MakeConst'