v4.21.0

• Spreadsheet cells can be formatted: fill, bold, italic, underline, strikethrough,
  text color, size and alignment.
• Paragraphs in a document can be aligned left, center, right or justified.
• A space typed into a document or a cell shows, and saving no longer turns spaces
  into no-break spaces.
• Spreadsheet fills show their real colors, and keep them in night mode.
• A document no longer loads images from the internet, and only a web link leaves it.
• In the free edition, the free tool comes first in the editing tools, so a small screen
  shows it.

What's Changed

• Cut the docs down and correct what went stale by @andiwand in #683
• Tap the edit and mark-up buttons again when a tap turns into a long press by @andiwand in #684
• Search the large text again when the WebView counts too early by @andiwand in #685
• Hide the emulator's error dialogs before the instrumented tests by @andiwand in #686
• Bump com.google.android.gms:play-services-ads from 25.4.0 to 25.5.0 by @dependabot[bot] in #687
• Bump github/codeql-action from 4.38.0 to 4.38.1 by @dependabot[bot] in #688
• Bump the androidx group with 2 updates by @dependabot[bot] in #691
• Bump gradle-wrapper from 9.7.1 to 9.8.0 by @dependabot[bot] in #692
• Bump com.diffplug.spotless from 8.10.2 to 8.10.3 by @dependabot[bot] in #693
• Bump github/codeql-action from 4.38.1 to 4.38.2 by @dependabot[bot] in #694
• Show every file in the picker, and start it at the last document by @andiwand in #696
• Take core 7.4.0, and format sheet cells and align paragraphs by @andiwand in #697
• Prepare 4.21.0: the free tool first, translations and store notes by @andiwand in #698
• Give Pro and Lite their own edit screenshot by @andiwand in #699
• Cut 4.21.0, and keep the editions out of the store notes by @andiwand in #700

Full Changelog: v4.20.1...v4.21.0