Prepare for better device categorization by moving everything to testing
subdir first.
[skip-ci]: chicken-egg problem: passing pmaports CI depends on pmbootstrap MR
depends on this MR
Related: postmarketos#16
* Rename deviceinfo variable flash_methods to flash_method
* Update pmb.config.deviceinfo_attributes / add sanity check
* Add test case that parses all deviceinfo files
@drebrez deserves much credit for this one for all the testing,
bisecting and for fixing everything. Thank you very much!
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* devices which need a custom weston.ini ship it with a install_if
subpackage, so it only gets installed when weston is installed. This
sounds complicated, but is actually pretty clean in the APKBUILD.
* postmarketos-ui-weston: has a weston.ini.default, which enables
xwayland and uses fbdev as backend (because that's what most
devices use!). It defaults to the weston.ini.default if there is no
weston.ini (as installed by the device package).
* changed spaces to tabs for consistency, general minor refactoring of
device-APKBUILDs
