Replace TrueTypeTableBuilder and CompilerOutput with a single class

[Snuffleupagus]

Given that both of these classes are so similar, let's replace them with a single DataBuilder class instead to reduce unnecessary code-duplication.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 98.70130% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 55.94%. Comparing base (a55cec4) to head (ac6a923).

Files with missing lines	Patch %	Lines
src/core/data_builder.js	97.67%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #21220      +/-   ##
==========================================
- Coverage   55.97%   55.94%   -0.03%     
==========================================
  Files         218      219       +1     
  Lines       59033    59017      -16     
==========================================
- Hits        33041    33016      -25     
- Misses      25992    26001       +9     

Flag	Coverage Δ
fonttest	8.68% <57.14%> (+<0.01%)	⬆️
unittest	55.20% <98.70%> (-0.03%)	⬇️
unittestcli	55.69% <98.70%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[Snuffleupagus]

/botio browsertest

[moz-tools-bot]

From: Bot.io (Windows)

---

Received

Command cmd_browsertest from @Snuffleupagus received. Current queue size: 0

Live output at: http://54.193.163.58:8877/4b28bf7826497cd/output.txt

[moz-tools-bot]

From: Bot.io (Linux m4)

---

Received

Command cmd_browsertest from @Snuffleupagus received. Current queue size: 0

Live output at: http://54.241.84.105:8877/60b828d48e3e7af/output.txt

[moz-tools-bot]

From: Bot.io (Linux m4)

---

Failed

Full output at http://54.241.84.105:8877/60b828d48e3e7af/output.txt

Total script time: 18.04 mins

• Regression tests: FAILED

  different ref/snapshot: 1

Image differences available at: http://54.241.84.105:8877/60b828d48e3e7af/reftest-analyzer.html#web=eq.log

[moz-tools-bot]

From: Bot.io (Windows)

---

Failed

Full output at http://54.193.163.58:8877/4b28bf7826497cd/output.txt

Total script time: 24.37 mins

• Regression tests: FAILED

  different ref/snapshot: 1

Image differences available at: http://54.193.163.58:8877/4b28bf7826497cd/reftest-analyzer.html#web=eq.log

[calixteman]

LGTM. Thank you.