* add _update_hook function support - these get run on updating retropie-setup.
* add update_hook functions for modules so they show up as installed on retropie-setup 4.x - eg modules that
previously just apt-get installed a package.
* get rid of _INFMSGS and instead have a rp_module_help field with information in.
this can then be displayed in the setup menus, and not just after configuring.
* use gui in setup functions that have a gui.
* default to yes for updating retropie-setup script
* split out update_packages to own function for use via retropie_packages.sh
* 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.
don't edit the screen timeout/blanking by default - those using the image have it already, but those installing on
raspbian may not want this changed - they can manually change it if needed from retropie-setup
remove unused / incomplete packagerepository module
These changes will make it slightly more convenient when updating the setup script so that people don't have to exit out and then go back in again each time they update the setup script.
