Esapy

Fixed
- WinError at removing temporary files
- post-mode option bug is fixed.

Added
- Enable folding in output markdown
- ignore: any cell will be opened.
- as-shown: cell folding obeys cell-metadata.
- auto: a code cell starting with `plt.figure` will be folded.
- Hashlist of images
- Once a image has been uploaded, it will never upload again. Upload history is recorded in metadata.
- Attachments
- attached images can be extracted and uploaded.
- Math codeblock
- simple latex equation environment `$$ ... $$` will be replaced as math-code block for avoiding mathjax escape.
- Work in temporary directory
- No temporary files leave after process.

Changed
- Internal process has been almost rewritten.

Removed
- subcommands

Added
- Add output options
- Non-destrutive replace & upload can be used (Default: non-destructive).

Fixed
- Capture FileNotFoundError when `.esapyrc` doesn't exist.

Added
- `[--edit-in-browser | --no-browser]` option for `esa up`
- open edit page on browser after publish
- default: `--edit-in-browser`

Fixed
- image upload even when alt-text is ""