[MERGE #2958 @dilijev] Fix some issues in CmdLineArgsParser
[MERGE #2958 @dilijev] Fix some issues in CmdLineArgsParser

Merge pull request #2958 from dilijev:cli-args

Add `=` as an equivalent character to `:` in ch arguments lists for things like `-dump:bytecode` (`-dump=bytecode`).

Microsoft/ChakraCore,Microsoft/ChakraCore,mrkmarron/ChakraCore,mrkmarron/ChakraCore,mrkmarron/ChakraCore,Microsoft/ChakraCore,mrkmarron/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,mrkmarron/ChakraCore,mrkmarron/ChakraCore,mrkmarron/ChakraCore,Microsoft/ChakraCore