Concurrency lock improvements

• #273
• #254

Allow buffer->node/buffer path mapping

In order to prevent incorrect resolution to the non-node, non-ambient 'buffer' module that DT infrastructure depends on.

Ship 4.3, deprecate 3.5

Also make lowercase required in all package names in notNeededPackages.json

Loosen delete rules in deprecation PRs

Previously, deprecation PRs were only allowed to delete files in package directories that were deprecated, and the entire directory had to be deleted.
This release allows deletes of single files outside deprecated packages, so that unneeded files in dependent packages can be deleted.
The entire deprecated package must still be deleted.

Add support for TS 4.4

v0.0.81

v0.0.81

[definitions-parser] Fix unused path mapping detection

#232

[definitions-parser] Fix scoped package older version path mappings

#231

[perf] Fix isVersionedBenchmark

• #230

[perf] Assert on toPackageKey

• #229

Merge some old PRs

v0.0.76

v0.0.76