Reorg file structure

[timkpaine]

No description provided.

[github-actions]

Test Results

11 tests   - 8   11 ✅  - 8   0s ⏱️ ±0s
 1 suites ±0    0 💤 ±0 
 1 files   ±0    0 ❌ ±0 

Results for commit 486b7e5. ± Comparison against base commit d5ae289.

This pull request removes 18 and adds 10 tests. Note that renamed tests count towards both.

chatom.tests.test_backend.TestBackend ‑ test_all_backends_listed
chatom.tests.test_mention.TestMention ‑ test_mention[user0-discord-<@!456>]
chatom.tests.test_mention.TestMention ‑ test_mention[user1-email-Alice]
chatom.tests.test_mention.TestMention ‑ test_mention[user10-symphony-@Frank]
chatom.tests.test_mention.TestMention ‑ test_mention[user11-teams-<at>Eve</at>]
chatom.tests.test_mention.TestMention ‑ test_mention[user12-telegram-@alice]
chatom.tests.test_mention.TestMention ‑ test_mention[user13-telegram-Bob]
chatom.tests.test_mention.TestMention ‑ test_mention[user14-whatsapp-@Grace]
chatom.tests.test_mention.TestMention ‑ test_mention[user15-zulip-@**Heidi**]
chatom.tests.test_mention.TestMention ‑ test_mention[user16-unknown-Ivan]
…

chatom.tests.test_enums.TestEnums ‑ test_all_backends_listed
chatom.tests.test_mention.TestMention ‑ test_mention[msg0-<@!456>]
chatom.tests.test_mention.TestMention ‑ test_mention[msg1-Alice]
chatom.tests.test_mention.TestMention ‑ test_mention[msg2-<a href='mailto:bob@example.com'>Bob</a>]
chatom.tests.test_mention.TestMention ‑ test_mention[msg3-charlie]
chatom.tests.test_mention.TestMention ‑ test_mention[msg4-David]
chatom.tests.test_mention.TestMention ‑ test_mention[msg5-@eve:matrix.org]
chatom.tests.test_mention.TestMention ‑ test_mention[msg6-<@123>]
chatom.tests.test_mention.TestMention ‑ test_mention[msg7-@Frank]
chatom.tests.test_mention.TestMention ‑ test_mention[msg8-Ivan]