* Run grep against /proc/modules directly instead of forking to lsmod
* Revamp the CPUFreq governor choice logic
I finally figured out why the scaling on the H2O was so wonky:
Because it relies on an obscure i.MX hardware feature called DVFS,
and it gets flipped for mysterious workaround-y reasons depending on
Wi-Fi state...
* Start playing with conservative, because just staying pegged at max
clock is entirely stupid.
And DVFS is extremely conservative, it needs somewhat sustained load to
clock up...
* Take care of the DVFS switcheroo in the Wi-Fi scripts
Update shellcheck and shfmt to the latest version.
Fixes <https://github.com/koreader/koreader/issues/5152>.
Btw, you can apply shellcheck suggestions with a command like:
```
shellcheck --include=SC2250 -f diff *.sh | git apply
```
add support for runtime permissions on api23+
add support for devices with a notch on api28+
fix some potential memory leaks
do not check luajit-launcher shell scripts
* translation text fix
* quickstart(fix): go back to home dir after document close
* quickstart(fix): purge old quick start files
* spec: fix quickstart tests
* Travis: speed up by caching base and running luacheck earlier
* ignore bin and install for git status change detection
* skip coverage except on official master branch. It adds 3 whole minutes and does nothing to prevent regressions
* also cache ~/.luarocks. It evens out but would generally prevent remote timeout shenenigans
* remove base cache dir before caching with verbose remove to see what's going on
* more inclusive shell code quality analysis
* fixed more shellcheck issues
* better shellcheck/shfmt debugging info
