Plugin refactor

[twizmwazin]

This is the first step of my plugin refactor. I have a roughly three step plan:

1. Improve and document the metadata specification to accommodate immediate needs of step 2
2. Implement loading of plugins from a user plugin directory, including site-packages
3. Add a basic UI that allows selecting the order in which plugins are initialized to allow users to sort-of handle dependency issues if they arise, and install new plugins through the UI

Current status: Step 1 is mostly done unless I hit a snag in the future. Schema tests pass.

[github-actions]

Test Results

8 tests   - 11   8 ✔️  - 11   0s ⏱️ - 1m 28s
3 suites  -   7   0 💤 ±  0 
3 files    -   7   0 ❌ ±  0 

Results for commit 2e5eb02. ± Comparison against base commit 4f1e1bc.

This pull request removes 14 and adds 3 tests. Note that renamed tests count towards both.

test_qaddress_input.TestQaddressInput ‑ test_address_conversion
test_qaddress_input.TestQaddressInput ‑ test_function_name
test_rename_functions.TestRenameFunctions ‑ test_rename_a_callee_in_pseudocode_view
test_rename_functions.TestRenameFunctions ‑ test_rename_a_function_in_disasm_and_pseudocode_views
test_rename_variables.TestRenameVariables ‑ test_rename_a_global_variable_in_pseudocode_view
test_rename_variables.TestRenameVariables ‑ test_rename_a_local_variable_in_pseudocode_view
test_tagged_interval_map.TaggedIntervalMapTests ‑ test_empty_iteration
test_tagged_interval_map.TaggedIntervalMapTests ‑ test_insertion_already_covered
test_tagged_interval_map.TaggedIntervalMapTests ‑ test_merge_left
test_tagged_interval_map.TaggedIntervalMapTests ‑ test_merge_middle
…

test_plugin_desciption_loading.TestPluginDescriptionLoading ‑ test_minimal_package
test_plugin_desciption_loading.TestPluginDescriptionLoading ‑ test_minimal_plugin
test_plugin_desciption_loading.TestPluginDescriptionLoading ‑ test_no_plugins

♻️ This comment has been updated with latest results.