Added flag for changing command line styles to support existing build flows from other tools

[udif]

Here is a preliminary pull request, mostly for reviews (I haven't added any tests yet, only manual tests). It supports a new '-style' flag with a mandatory parameter whose value must be either m, c or s. At the moment it only adds '-incdir' , '-libext', '-define', '-liborder', '-librescan'. I've manually tested '-define', and even that was not tested too deeply.

If the general direction here is OK, I'll clean this up and add automatic tests.