Dotdrop

* new dynamic/interpreted variables available (see `dynvariables` in the [doc](https://github.com/deadc0de6/dotdrop#interpreted-variables))
* new option to ignore deployment of empty template (see `ignoreempty` in the [config](https://github.com/deadc0de6/dotdrop#config))
* new command `detail` to list dotfile details (see the [doc](https://github.com/deadc0de6/dotdrop#list-dotfiles))
* some improvements (test, error message, refactoring)

* fix bug in update directory (63)

* add ability to update by key or all keys for a profile (see the [doc](https://github.com/deadc0de6/dotdrop#update-dotfiles))
* fix issues with showdiff on templated dotfiles
* some refactoring
* update documentation

* add option to show a diff before asking the user to overwrite local dotfile
(see `--showdiff` and `showdiff` in [config](https://github.com/deadc0de6/dotdrop#config))
* refactor `compare` option to select only specific dotfiles
from `--files` to `--file` to properly handle paths with space
* clean temporary directory created in tmp after `compare`

* fail and shout if cannot import dotfile
* fail early if source dotfile does not exist

* add ability to deploy only specific dotfile when `install` (see the [doc](https://github.com/deadc0de6/dotdrop#update-dotfiles))
* ensures absolute path is stored when importing file with relative path
* add ability to control banner printing with env variable (`DOTDROP_NOBANNER`)
* fix minor bugs