Uniplot

Fixed
- Fixed view reset in interactive mode.
- Fixed incorrect reset after keypress in interactive mode when using legend labels.

Improved
- Significant performance improvements using batch logic. Plotting is up to 33x faster
for sparse plots. See PRs 40 and 42 on GitHub for details. Thanks a lot to
PabloRuizCuevas for providing ideas, pull request and iterating on it!
Fixed
- `plot_gen` crashed when no options changed in a new iteration. Thanks to
PabloRuizCuevas for pointing this out!

Fixed
- Fixed center alignment of titles or legend labels that are longer than the hard cap.

Improved
- Simplified example scripts, and added comments for readability.
- Improved Readability of the Readme.

Fixed
- Gridlines were not displayed when using Braille characters.
- Legend labels are now drawn correctly when using the Braille character set.

Fixed
- Fixed datetime labels with non-zero-aligned start time.

Added
- Examples folder.
- Added `plot_gen` function to support streaming use cases, and streaming
example script. Thanks to PabloRuizCuevas for idea and PR!