Add ecwolf port

[tpo1990]

ECWolf is an advanced source port for Wolfenstein 3D, Spear of Destiny, and Super 3D Noah's Ark based off of the Wolf4SDL code base. ECWolf pulls a substantial amount of code from ZDoom and aims to provide a wide array of mod editing capabilities without the need to modify the source code.

[joolswills]

Thanks. This may have to wait until we have completed fkms/rpi4 work though.

[tpo1990]

Thank you. No problem. It will wait until rpi4 work is complete.

[crcerror]

@tpo1990
They removed the mecurial usage from the bitbucket repo I would suggest to use

gitPullOrClone "$md_build" "https://bitbucket.org/ecwolf/ecwolf"

the mv command is also useless now ...
@joolswills
Should we stick to a fixed commit because the patch I've prepared for getting ESC and PAUSE key for button map in ecwolfs setup is still valid in newest version. But that may change in time...

---

This is just a small script if someone decides to keep the zip download
Script to obtain zip files from bitbuckets index file

[tpo1990]

I have replaced the downloadAndExtract from source with gitPullOrClone which is a much better approach of pulling from the ecwolf bitbucket repo and pushed the change into this PR.

This has already been tested as working before updating the commits.