Preference fixes and miscellaneous project cleanup

[TacoTheDank]

Hello.

1st commit

• Deleted the .idea files as they are automatically generated (and thus unnecessary for Git tracking). They also muddy up commits and make them harder to read.

2nd commit

• Updated the gradle wrapper to 7.4.2 using git bash (this regenerates the gradlew stuff to the corresponding version)

3rd commit

• Remove the unused legacy support library

4th commit

• Reformatted the preferences XMLs because they were hard to look at and read well

5h commit

• Replaced the CheckBoxPreference with SwitchPreferenceCompat as recommended by material guidelines

6th commit

• Got rid of the extra spacing on the left side of the preferences

7th commit

• Simplified the setting of the ListPreference summaries by using the "useSimpleSummaryProvider" attribute

[chrisboyle]

Thanks :-) I'm going to leave out the first two commits:

• the first because there is at least some state I find it useful to carry between machines this way e.g. the spelling dictionary, but there is probably scope for a more fine-grained cull of .idea separately. I'm certainly finding the updates to misc.xml annoying lately.
• the second just because it's much easier for me to just update gradle myself in Android Studio than to actually review all those bash changes in a PR

...but the rest looks good from a quick look, will review properly tomorrow.

[chrisboyle]

I've cherry-picked these commits into main with the above exceptions, thanks again

[TacoTheDank]

Thanks! That's fine :)

• the second just because it's much easier for me to just update gradle myself in Android Studio than to actually review all those bash changes in a PR

I think you forgot to update the bash files. The command I ran in git bash was ./gradlew wrapper --gradle-version 7.4.2 --distribution-type bin --warning-mode all. You can check the integrity using https://gradle.org/release-checksums/