Dvc

* gdrive: add workaround for downloading empty files (4287) efiop
* version: redesign output format for the dvc version command 3499 (4114) sahilbhosale63

* daemon: use Popen on Mac (4296) efiop

* experiments: temporarily disable styling in `show` table (4290) pmrowla
* ignore: dynamically collect dvcignore (4284) efiop
* add toml support for ParamsDependency (4258) dtrifiro
* dvc: properly handle relative symlinks (4275) efiop
* ignore: use `use_dvcignore` flag (4274) efiop
* dvc: add dvc/utils/build.py to gitignore (4272) efiop
* config: don't switch between trees (4271) efiop

* build: fix pyinstaller build (4264) efiop
* daemon: don't use Popen on linux/mac (4262) efiop
* tests: check if docker is present (4263) efiop
* Optimize dvcignore (4242) karajan1001
* erepo: --rev BRANCH: shallow clone (4246) pmrowla
* dvc: separate cache and remote classes (4245) efiop
* tree: use cache.tree to check if cache file exists (4244) efiop
* Consolidate trees (4243) efiop
* dvc: get rid of BaseTree in favor of BaseRemoteTree (4240) efiop
* S3: Use key_id and key_secret directly (4224) farizrahman4u
* Experiments proof of concept (4199) pmrowla
* snap: deploy: fix major channels not being pushed (4222) casperdcl

* LocalRemoteTree: use repo tree as work_tree with local outputs (4125) pared
* RepoDependency: never changed (4209) pared
* dvc: get rid of CleanTree (4221) efiop
* Bump networkx (4219) faucct
* dvc: get rid of WorkingTree (4216) efiop
* tree: remove duplicated code (4215) efiop
* dvc: remove tree-specific wrappers from cache (4214) efiop
* dvc: split remotes from trees (4212) efiop
* deps/outs: get rid of remotes in favor of trees (4208) efiop
* Optimize ignore performance (4120) karajan1001
* list: support tracked file path as a target (4204) efiop
* tests: http: fix typo (4201) efiop
* tests: remove real SSH (4200) efiop
* remove: remove dvc.yaml and dvc.lock if they are empty (4196) nik123

* pull: target message (4192) dmpetrov