Updated the default branch, since upstream changed the project repository's default to 'main'.
Since the `cmake` requirements have been bumped to 3.14 some time ago, select the closest tag before the change in order to fix building on Ubuntu 18.04.
Note also that current code requires C++17 'filesystem' support, which is not present in Ubuntu 18.04.
Older versions actually throw an error regarding CXX17 dialect support but seems to build fine. If needed
we can roll back further, but we will need to stop support for Stretch and Ubuntu 18.04 soon due to the work
required to maintain modules for older toolchains.
* added sdl2, bzip2 and libspectrum dependencies
* run cmake - no makefile in repo
* add check for successful build
* use Makefile install
* enable for mali and kms
* rp_module_menus is no more - instead use rp_module_section with one of
- core (core packages)
- main (main packages - which will be installed by default in the image)
- opt (optional packages)
- exp (experimental packages)
- driver (driver packages)
- config (configuration packages / tools)
* The setup menu organises the data based on the above sections. more could be added in the future if needed. Packages (internally modules), can be added / configured / removed individually, or as entire sections.
* The setup menu will automatically detect if a binary is available to be installed. the nobin flag is no longer needed. modules that install directly from binary via aptInstall or via a prebuilt binary need to use an install_bin_ function instead of install_
* rp_module_section of type "config" will have the "gui_" function called first if it's available, otherwise a standard depends/sources/build/install/configure will be called
* configure is no longer used for "gui" configuration function - use gui_ instead. Had already started to move to this before, but now it is required.
