Registration dialogs don't follow platform styles

[nikclayton]

The registration dialogs don't follow platform styles.

It currently looks like this:

I'm about to send some PRs that fix this, and now it looks like this:

They're stacked one of top of another for easy review.

There's a sixth PR that uses androidx.appcompat to get proper styling for the dialog. The result of that one is

However, that requires bumping the min SDK value, which you might not be in favour of.

I'll come back and update this issue with a link to the PRs in a minute.

PRs (in order, as I say, they're stacked, so each one includes the changes from the previous one).

• fix: Set rootProject.name to Gradle approved characters #88
• chore(deps): Update JVM toolchain, kotlin, gradle dependencies #89
• fix: Re-register if the active distributor was deleted  #90
• fix: Update "No distributor found" dialog #91
• fix(l10n): Use resource strings for default dialog string resources #92
• fix: Use androidx.appcompat for better AlertDialog styling #93