Easychart

What's new
- `**kwargs` passed to `Chart.export` are passed to the `requests.post` API request

Bug fixes
None

Docs
None

Chores
- Refactored testing pipeline
- Run ruff checks

What's new
- new convenience arguments for `marker` in `chart.plot`: `markersize` (or `ms`), `markercolor` (or `mc`), `markerlinewidth` (or `mlw`), `markerlinecolor` (or `mlc`)

Bug fixed
- passing `xformat=:.2%` in `easychart.new` was not parsed correctly

Docs
None

What's new
- specifying number of decimals to use when setting `yformat` in `easychart.new` (e.g. `:.2%`)
- support for stock charts using the new `constr` argument in `easychart.new`

Bug fixed
None

Docs
None

What's new
None

Bug fixed
- Fixed infinite recursion error on setting `chart.exporting = {"enabled":True}`

Docs
None

What's new
- `easychart.Chart` is now idempotent
- hoisted `easychart.rendering` to top-level module

Bugfix
None

Docs
- Documented how to integrate easychart with Streamlit

New features
- `chart.export` to convert a chart to a static format (PNG, JPG, SVG) using an export server