Dev environment

[walkero-gr]

We need a proper development environment that will:

• [x] be able to be used from anyone, no matter of the preferred OS
• [x] have all the necessary information on how someone can create his own
• [x] use the new clib2
• [x] cmake 3.16.2 or above
• [x] GNU make
• [x] Log the process at repo wiki pages

[walkero-gr]

I created new docker images including all the above for different versions of gcc at https://hub.docker.com/repository/docker/walkero/amigagccondocker

With this project is recommended to use gcc 11, as it has all the latest features and fixes. The repo for these images, where someone can find information of how these were created and can be used is at https://github.com/walkero-gr/AmigaGCConDocker

If you want to use the new clib2, please use the docker images that have a tag with -newclib2 in their names.

Also created https://github.com/walkero-gr/webkitty/wiki/Development-environment with some info, but it is not finalised yet.