Remove g from py5

[hx2A]

Currently py5.g is deprecated. This issue is a reminder to remove it completely from py5 in a future build.

• remove g
• confirm that it is no longer a reserved name for a variable or a function
• update the reference documentation. Should it be removed completely, or add a note saying "as of version X, this has been removed from py5?"

See #317 for prior discussion.

[villares]

I like the idea of leaving some note about the removal!

[hx2A]

I like the idea of leaving some note about the removal!

OK, that's what I will do.

[villares]

This page's example will be affected by the g removal: https://py5coding.org/reference/py5graphics_next_page.html

[hx2A]

This page's example will be affected by the g removal: https://py5coding.org/reference/py5graphics_next_page.html

Good catch! I just fixed that. There shouldn't be any deprecated code in the documentation.

There are no other similar examples and no links to the .g reference doc pages.