Fontsize update and VisualAstro V0.3.0

[qiushitian]

Fontsize Update :)

• adds config.fontsizes which now replaces config.fontsize. config.fontsizes.size is the direct replacement.

• config.fontsizes holds the base fontsize (.size), as well as the scaling factors for all the other fontsize properties of the figure (axes labels, tick labels, legend, etc).

• config.fontsizes.update_rcparams will update the global rcparams of mpl so that they match the settings used by VisualAstro!

• Changed the __repr__ so that it shows both the fontsize in pts and the scaling factor of each field in config.fontsizes

• cleaned up config a little bit, ie. config.legend.fontsize now 'points' to config.fontsizes.legend.

• wired up config.fontsizes to interface.py such that all VisualAstro plotting functions now use the fontsizes automatically

• users can bypass the fontsizes either through the config, or by passing in the kwarg directly (ie label_fontsize)

• note: should add more aliases for this

• Now title, axes labels, axes tick labels, legend, cbar label, and cbar tick label fontsizes can all be changed

• implement legend title

• added setting title to interface.py so all va functions can set title now

• further cleanup of plotting/core/utils.py by moving add_colorbar to colorbar.py

• Fix MANIFEST.in, pyproject.toml, README

• closes Add some exemplary plots and colorsets to ReadMe #73

[shadowbehindthebread]

VA 0.3.0 😱🤯🙀‼️⁉️❣️ SUPER AWESOME !!!
GOOD WORK TEAM 💖✨🌠💫

[shadowbehindthebread]

v nice

[shadowbehindthebread]

FIRREEEEE 🔥🔥🔥🔥🔥🔥🔥🔥🤩🤩🤩🤩🤩🤩

[shadowbehindthebread]

WOOOO I LOVE THE NUMBER 3

[shadowbehindthebread]

NIIICE I LIKE THE DESCRIPTION