fix #431 - directory not ignored with negative pattern

[deadc0de6]

fix #431

The issue lies in the fact we do not ignore directories when there is any negative ignore pattern defined. This is to force the caller to enter the directory and evaluate any potential negative ignore pattern inside it.

See https://github.com/deadc0de6/dotdrop/blob/master/dotdrop/utils.py#L307

• [x] discard empty directory
• [x] static instead of recursive search (construct diff from static tree of both sides and then compare)
• [x] see if the same applies to the other commands
  • [x] compare
  • [x] install
  • [x] update
  • [x] import
  • [x] uninstall

[codecov[bot]]

Codecov Report

Attention: 20 lines in your changes are missing coverage. Please review.

Comparison is base (de05935) 89.81% compared to head (31e466e) 91.02%.

Files	Patch %	Lines
dotdrop/updater.py	78.84%	11 Missing :warning:
dotdrop/importer.py	87.23%	6 Missing :warning:
dotdrop/comparator.py	94.28%	2 Missing :warning:
dotdrop/dotdrop.py	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #432 +/- ## ========================================== + Coverage 89.81% 91.02% +1.20% ========================================== Files 21 22 +1 Lines 4791 4746 -45 ========================================== + Hits 4303 4320 +17 + Misses 488 426 -62 ```

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[deadc0de6]

install and uninstall won't use the new ftree since those are handling a lot more than just copying/removing files (backups, transformations, etc).